| Year | Côte d’Ivoire | Ethiopia | Kenya | Nigeria | Rwanda | Tanzania | Guyana | Haiti | Vietnam |
|---|---|---|---|---|---|---|---|---|---|
| 1980 | 0 | 0 | 0 | 0 | 0.67 | 0 | 0 | 0 | 0 |
| 1981 | 0.09 | 0 | 0 | 0.04 | 1.16 | 0.09 | 0.06 | 0.14 | 0 |
| 1982 | 0.23 | 0 | 0 | 0.06 | 1.89 | 0.15 | 0.13 | 0.46 | 0 |
| 1983 | 0.38 | 0.04 | 0 | 0.14 | 2.83 | 0.29 | 0.24 | 1.35 | 0 |
| 1984 | 0.62 | 0.08 | 0 | 0.21 | 3.86 | 0.45 | 0.45 | 2.9 | 0 |
| 1985 | 1.01 | 0.2 | 0 | 0.3 | 4.77 | 0.69 | 0.79 | 4.37 | 0 |
| 1986 | 1.59 | 0.32 | 0.03 | 0.43 | 5.44 | 1.04 | 1.3 | 5.44 | 0 |
| 1987 | 2.35 | 0.5 | 0.19 | 0.62 | 5.83 | 1.54 | 1.94 | 6.14 | 0 |
| 1988 | 3.22 | 0.77 | 0.81 | 0.87 | 5.99 | 2.23 | 2.6 | 6.46 | 0 |
| 1989 | 4.05 | 1.13 | 2.01 | 1.21 | 5.99 | 3.13 | 3.11 | 6.5 | 0 |
| 1990 | 4.72 | 1.56 | 3.11 | 1.65 | 5.89 | 4.2 | 3.43 | 6.38 | 0 |
| 1991 | 5.17 | 2.01 | 4.45 | 2.18 | 5.74 | 5.39 | 3.55 | 6.2 | 0 |
| 1992 | 5.44 | 2.41 | 5.92 | 2.77 | 5.58 | 6.55 | 3.54 | 6 | 0 |
| 1993 | 5.58 | 2.73 | 7.33 | 3.38 | 5.42 | 7.57 | 3.44 | 5.81 | 0 |
| 1994 | 5.65 | 2.98 | 8.5 | 3.97 | 5.29 | 8.36 | 3.29 | 5.66 | 0.01 |
| 1995 | 5.69 | 3.17 | 9.32 | 4.47 | 5.19 | 8.89 | 3.12 | 5.55 | 0.02 |
| 1996 | 5.74 | 3.32 | 9.76 | 4.87 | 5.11 | 9.2 | 2.95 | 5.48 | 0.08 |
| 1997 | 5.8 | 3.46 | 9.88 | 5.16 | 5.07 | 9.33 | 2.8 | 5.44 | 0.12 |
| 1998 | 5.9 | 3.59 | 9.71 | 5.34 | 5.05 | 9.33 | 2.68 | 5.44 | 0.23 |
| 1999 | 6.02 | 3.74 | 9.34 | 5.44 | 5.05 | 9.25 | 2.58 | 5.45 | 0.3 |
| 2000 | 6.17 | 3.89 | 8.62 | 5.48 | 5.05 | 9.14 | 2.52 | 5.48 | 0.33 |
| 2001 | 6.34 | 4.06 | 8.03 | 5.47 | 5.07 | 9.01 | 2.48 | 5.51 | 0.35 |
| 2002 | 6.52 | 4.22 | 7.39 | 5.44 | 5.08 | 8.88 | 2.47 | 5.54 | 0.44 |
| 2003 | 6.71 | 4.39 | 6.74 | 5.4 | 5.09 | 8.77 | 2.49 | 5.56 | 0.47 |
| 2004 | 6.88 | 4.55 | 6.14 | 5.36 | 5.09 | 8.68 | 2.51 | 5.58 | 0.47 |
| 2005 | 7.04 | 4.69 | 5.27 | 5.32 | 5.09 | 8.62 | 2.55 | 5.59 | 0.47 |
| 2006 | 7.18 | 4.81 | 4.48 | 5.28 | 5.08 | 8.59 | 2.58 | 5.59 | 0.47 |
| 2007 | 7.3 | 4.91 | 3.78 | 5.26 | 5.06 | 8.57 | 2.61 | 5.58 | 0.47 |
| 2008 | 7.39 | 4.99 | 3.15 | 5.24 | 5.05 | 8.57 | 2.64 | 5.58 | 0.47 |
| 2009 | 7.45 | 5.04 | 2.61 | 5.24 | 5.03 | 8.57 | 2.66 | 5.57 | 0.47 |
| 2010 | 7.5 | 5.08 | 2.15 | 5.24 | 5.01 | 8.58 | 2.67 | 5.56 | 0.47 |
| 2011 | 7.53 | 5.1 | 1.78 | 5.24 | 4.96 | 8.59 | 2.68 | 5.55 | 0.47 |
| 2012 | 7.54 | 5.12 | 1.47 | 5.25 | 4.89 | 8.6 | 2.67 | 5.55 | 0.47 |
| 2013 | 7.55 | 5.13 | 1.23 | 5.25 | 4.83 | 8.61 | 2.67 | 5.55 | 0.47 |
| 2014 | 7.55 | 5.13 | 1.04 | 5.26 | 4.77 | 8.62 | 2.66 | 5.55 | 0.47 |
| 2015 | 7.54 | 5.13 | 0.89 | 5.27 | 4.72 | 8.63 | 2.66 | 5.54 | 0.47 |
Source: U.S. Census Bureau, International Programs Center, unpublished tables.
| Graphic Version |