| 年份 | 纳米比亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 3.303 |
| 2020 | 3.349 |
| 2019 | 3.404 |
| 2018 | 3.462 |
| 2017 | 3.511 |
| 2016 | 3.574 |
| 2015 | 3.604 |
| 2014 | 3.635 |
| 2013 | 3.653 |
| 2012 | 3.676 |
| 2011 | 3.658 |
| 2010 | 3.63 |
| 2009 | 3.613 |
| 2008 | 3.587 |
| 2007 | 3.552 |
| 2006 | 3.535 |
| 2005 | 3.56 |
| 2004 | 3.58 |
| 2003 | 3.619 |
| 2002 | 3.716 |
| 2001 | 3.827 |
| 2000 | 3.975 |
| 1999 | 4.11 |
| 1998 | 4.152 |
| 1997 | 4.154 |
| 1996 | 4.212 |
| 1995 | 4.426 |
| 1994 | 4.671 |
| 1993 | 4.891 |
| 1992 | 5.067 |
| 1991 | 5.225 |
| 1990 | 5.321 |
| 1989 | 5.47 |
| 1988 | 5.58 |
| 1987 | 5.672 |
| 1986 | 5.767 |
| 1985 | 5.854 |
| 1984 | 5.929 |
| 1983 | 5.999 |
| 1982 | 6.075 |
| 1981 | 6.164 |
| 1980 | 6.246 |
| 1979 | 6.316 |
| 1978 | 6.384 |
| 1977 | 6.446 |
| 1976 | 6.496 |
| 1975 | 6.544 |
| 1974 | 6.564 |
| 1973 | 6.557 |
| 1972 | 6.548 |
| 1971 | 6.553 |
| 1970 | 6.545 |
| 1969 | 6.549 |
| 1968 | 6.535 |
| 1967 | 6.51 |
| 1966 | 6.488 |
| 1965 | 6.461 |
| 1964 | 6.433 |
| 1963 | 6.402 |
| 1962 | 6.342 |
| 1961 | 6.272 |
| 1960 | 6.205 |