| Year | Average threshold for a family of four people1 | CPI-U | CPI-U-X12 |
|---|---|---|---|
| 2002 | 18,392 | 179.9 | 179.9 |
| 2001 | 18,104 | 177.1 | 177.1 |
| 2000 | 17,603 | 172.2 | 172.2 |
| 1999 | 17,029 | 166.6 | 166.6 |
| 1998 | 16,660 | 163.0 | 163.0 |
| 1997 | 16,400 | 160.5 | 160.5 |
| 1996 | 16,036 | 156.9 | 156.9 |
| 1995 | 15,569 | 152.4 | 152.4 |
| 1994 | 15,141 | 148.2 | 148.2 |
| 1993 | 14,763 | 144.5 | 144.5 |
| 1992 | 14,335 | 140.3 | 140.3 |
| 1991 | 13,924 | 136.2 | 136.2 |
| 1990 | 13,359 | 130.7 | 130.7 |
| 1989 | 12,674 | 124.0 | 124.0 |
| 1988 | 12,092 | 118.3 | 118.3 |
| 1987 | 11,611 | 113.6 | 113.6 |
| 1986 | 11,203 | 109.6 | 109.6 |
| 1985 | 10,989 | 107.6 | 107.6 |
| 1984 | 10,609 | 103.9 | 103.9 |
| 1983 | 10,178 | 99.6 | 99.6 |
| 1982 | 9,862 | 96.5 | 95.6 |
| 1981 | 9,287 | 90.9 | 90.1 |
| 1980 | 8,414 | 82.4 | 82.3 |
| 1979 | 7,412 | 72.6 | 74.0 |
| 1978 | 6,662 | 65.2 | 67.5 |
| 1977 | 6,191 | 60.6 | 63.2 |
| 1976 | 5,815 | 56.9 | 59.4 |
| 1975 | 5,500 | 53.8 | 56.2 |
| 1974 | 5,038 | 49.3 | 51.9 |
| 1973 | 4,540 | 44.4 | 47.2 |
| 1972 | 4,275 | 41.8 | 44.4 |
| 1971 | 4,137 | 40.5 | 43.1 |
| 1970 | 3,968 | 38.8 | 41.3 |
| 1969 | 3,743 | 36.7 | 39.4 |
| 1968 | 3,553 | 34.8 | 37.7 |
| 1967 | 3,410 | 33.4 | 36.3 |
| 1966 | 3,317 | 32.4 | 35.2 |
| 1965 | 3,223 | 31.5 | 34.2 |
| 1964 | 3,169 | 31.0 | 33.7 |
| 1963 | 3,128 | 30.6 | 33.3 |
| 1962 | 3,089 | 30.2 | 32.8 |
| 1961 | 3,054 | 29.9 | 32.5 |
| 1960 | 3,022 | 29.6 | 32.2 |
| 1959 | 2,973 | 29.1 | 31.6 |
| 1958 | (NA) | 28.9 | 31.4 |
| 1957 | (NA) | 28.1 | 30.5 |
| 1956 | (NA) | 27.2 | 29.6 |
| 1955 | (NA) | 26.8 | 29.1 |
| 1954 | (NA) | 26.9 | 29.2 |
| 1953 | (NA) | 26.7 | 29.0 |
| 1952 | (NA) | 26.5 | 28.8 |
| 1951 | (NA) | 26.0 | 28.3 |
| 1950 | (NA) | 24.1 | 26.2 |
| 1949 | (NA) | 23.8 | 25.9 |
| 1948 | (NA) | 24.1 | 26.2 |
| 1947 | (NA) | 22.3 | 24.2 |
(NA) - Not available