POPULATION PROJECTIONS OF THE UNITED STATES BY AGE, SEX, RACE, HISPANIC ORIGIN, AND NATIVITY: 1999 TO 2100 Source: Population Projections Program, Population Division, U.S. Census Bureau, Washington, D.C. 20233 (301) 763-2436 Internet Release Date: January 13, 2000 I. DATA FILE DESCRIPTION (NP-D5) Component Assumptions of the Resident Population by Age, Sex, Race, and Hispanic Origin: Lowest, Middle, and Highest Series, 1999 to 2100 (NP-D5-B) AGE-SPECIFIC FERTILITY RATES AND TOTAL FERTILITY RATES The fertility assumptions for the population projections are presented as the calendar year age-specific fertility rates and total fertility rates for U.S. resident women. The data include single year age-specific fertility rates and total fertility rates by race and Hispanic origin for each year between 1999 and 2100. Files are available for the middle, lowest, and highest series and are only accessible on the World Wide Web. There are no corresponding electronic products. II. UNIVERSE DESCRIPTION The projections are produced for the resident population of the United States which includes people who reside in the 50 states and the District of Columbia. They exclude residents of the Commonwealth of Puerto Rico, and residents of the outlying areas under United States sovereignty or jurisdiction (principally American Samoa, Guam, Virgin Islands of the United States, and the Commonwealth of the Northern Mariana Islands). The definition of residence conforms to the criteria used in the 1990 census, which defines a resident of a specified area as a person "usually resident" in that area. The projections exclude the United States Armed Forces Overseas, as well as civilian United States citizens whose usual place of residence is outside the United States. III. TECHNICAL DESCRIPTION (NP-D5-B) AGE-SPECIFIC FERTILITY RATES FILE TYPE: ASCII FILE SIZE: File Name* Number of Records Columns Variables Bytes ASFR.A 1,045,500 41,820 23 6 ASFR.B 1,045,500 41,820 23 6 ASFR.C 1,045,500 41,820 23 6 SORT SEQUENCE: The records are first sorted by the series, followed by race, year, and age. Age is listed in single year intervals in ascending order with exception to the final age category, "999," which represents the total fertility rate. * The extension represents the series: A=middle B=lowest C=highest. IV. EXPLANATION OF DATA FIELDS Series: The extension for each file name describes the series. The letter "A" represents middle series data; "B," the lowest series; and "C," the highest series. Year: Annually from 1999 to 2100. Age-specific fertility rates and total fertility rates are calculated for the calendar year. Age: Rates are calculated for U.S. resident women 10 to 49 years of age. Each code represents a single year of age, except for "999," which represents the total fertility rate for all women between 10 to 49 years old. Race and Hispanic The data are shown for the Total; White; Black; American Origin: Indian, Eskimo, and Aleut; and Asian and Pacific Islander populations. Data are also shown for the Hispanic origin population, and the non-Hispanic White; non-Hispanic Black; non-Hispanic American Indian, Eskimo, and Aleut; and non-Hispanic Asian and Pacific Islander populations. Persons of Hispanic origin may be of any race. A = Total population B = White population C = Black population D = American Indian, Eskimo, and Aleut population E = Asian and Pacific Islander population F = Hispanic origin population G = non-Hispanic White H = non-Hispanic Black I = non-Hispanic American Indian, Eskimo, and Aleut population J = non-Hispanic Asian and Pacific Islander population Age- The number of live births occurring in the calendar year to U.S. Specific resident women of a specific age divided by the mid-year Fertility (July 1) resident female population in the corresponding Rate: age group. Rates are calculated by single year of age for women between 10 and 49 years and are expressed per 1,000 women. Total The standardized measure of the average number of live births per Fertility 1,000 women experiencing specific age-specific fertility rates Rate: throughout their childbearing years without accounting for mortality. V. RECORD LAYOUT Fertility Files: File Name File Description ASFR.A US resident population age-specific fertility rates and total fertility rates: middle series, 1999 to 2100 ASFR.B US resident population age-specific fertility rates and total fertility rates: lowest series, 1999 to 2100 ASFR.C US resident population age-specific fertility rates and total fertility rates: highest series, 1999 to 2100 Location Length Type Data 1 2 Character Series (A, B, or C) 3 1 Character Race 4-6 3 Character Identification (ASF) 7-10 4 Numeric Year (four digits) 11-13 3 Numeric Age (years) 14-23 10 Numeric Age-specific fertility rates and total fertility rates VI. RACE AND ETHNIC DEFINITIONS AND CONCEPTS The racial classification used by the Census Bureau generally adheres to the guidelines in Federal Statistical Directive No. 15, issued by the Office of Management and Budget, which provides standards on race and Hispanic origin categories for statistical reporting to be used by all Federal agencies. The race and Hispanic origin categories are defined as follows: American Indian, Eskimo, and Aleut: A person having origins in any of the original peoples of North America, who maintains cultural identification through tribal affiliation or community recognition. Asian and Pacific Islander: A person having origins in any of the original peoples of the Far East, Southeast Asian, the Indian subcontinent, or the Pacific Islands. This area includes, for example, China, India, Japan, Korea, the Philippine Islands, and Samoa. Black: A person having origins in any of the black racial groups of Africa. Hispanic: A person of Mexican, Puerto Rican, Cuban, Central or South American or other Spanish culture or origin, regardless of race. White: A person having origins in any of the original peoples of Europe, North Africa, or the Middle East. VII. ASSUMPTIONS AND METHODOLOGY The population projections are created using the cohort-component model. For a detailed description of the model, the assumptions, and the data used to create these projections, see the working paper, "Methodology and Assumptions for the Population Projections of the United States: 1999 to 2100, Working Paper #38." This paper can be obtained at the national projections internet site on the World Wide Web or by contacting the Statistical Information Staff by telephone at (301) 763-2422, or by e-mail at POP@CENSUS.GOV (please include telephone number).