| 年份 | 纳米比亚 |
|---|---|
| 2023 | - |
| 2022 | 4.31019 |
| 2021 | 4.29684 |
| 2020 | 4.27305 |
| 2019 | 4.24229 |
| 2018 | 4.20851 |
| 2017 | 4.17435 |
| 2016 | 4.13446 |
| 2015 | 4.08583 |
| 2014 | 4.02657 |
| 2013 | 3.95668 |
| 2012 | 3.87711 |
| 2011 | 3.7878 |
| 2010 | 3.69071 |
| 2009 | 3.58928 |
| 2008 | 3.48762 |
| 2007 | 3.39123 |
| 2006 | 3.30614 |
| 2005 | 3.2349 |
| 2004 | 3.17855 |
| 2003 | 3.13708 |
| 2002 | 3.11402 |
| 2001 | 3.1112 |
| 2000 | 3.12148 |
| 1999 | 3.13516 |
| 1998 | 3.14619 |
| 1997 | 3.16386 |
| 1996 | 3.19171 |
| 1995 | 3.2199 |
| 1994 | 3.24662 |
| 1993 | 3.26998 |
| 1992 | 3.27036 |
| 1991 | 3.23717 |
| 1990 | 3.18446 |
| 1989 | 3.09408 |
| 1988 | 2.99143 |
| 1987 | 2.91961 |
| 1986 | 2.85322 |
| 1985 | 2.79312 |
| 1984 | 2.74209 |
| 1983 | 2.70284 |
| 1982 | 2.67952 |
| 1981 | 2.69009 |
| 1980 | 2.73235 |
| 1979 | 2.78542 |
| 1978 | 2.86898 |
| 1977 | 2.9706 |
| 1976 | 3.06394 |
| 1975 | 3.14851 |
| 1974 | 3.22095 |
| 1973 | 3.27952 |
| 1972 | 3.32154 |
| 1971 | 3.35916 |
| 1970 | 3.40403 |
| 1969 | 3.4505 |
| 1968 | 3.49357 |
| 1967 | 3.53646 |
| 1966 | 3.57921 |
| 1965 | 3.61984 |
| 1964 | 3.65957 |
| 1963 | 3.70165 |
| 1962 | 3.74365 |
| 1961 | 3.78165 |
| 1960 | 3.81452 |