| 年份 | 纳米比亚 |
|---|---|
| 2023 | - |
| 2022 | 3.22459 |
| 2021 | 3.48673 |
| 2020 | 3.64322 |
| 2019 | 3.68705 |
| 2018 | 3.79922 |
| 2017 | 3.91041 |
| 2016 | 4.00211 |
| 2015 | 4.07115 |
| 2014 | 4.09364 |
| 2013 | 4.09814 |
| 2012 | 4.08062 |
| 2011 | 3.98673 |
| 2010 | 3.97396 |
| 2009 | 3.93432 |
| 2008 | 3.8915 |
| 2007 | 3.84048 |
| 2006 | 3.83451 |
| 2005 | 3.87475 |
| 2004 | 3.96415 |
| 2003 | 4.16888 |
| 2002 | 4.31981 |
| 2001 | 3.63619 |
| 2000 | 3.89763 |
| 1999 | 4.04212 |
| 1998 | 4.13862 |
| 1997 | 4.24153 |
| 1996 | 4.4192 |
| 1995 | 4.64742 |
| 1994 | 4.86524 |
| 1993 | 4.94471 |
| 1992 | 4.68526 |
| 1991 | 4.29405 |
| 1990 | 7.0426 |
| 1989 | 7.37211 |
| 1988 | 4.54228 |
| 1987 | 4.22253 |
| 1986 | 4.08522 |
| 1985 | 3.87013 |
| 1984 | 3.72983 |
| 1983 | 3.67573 |
| 1982 | 2.8237 |
| 1981 | 2.30759 |
| 1980 | 3.08626 |
| 1979 | 2.76892 |
| 1978 | 2.86606 |
| 1977 | 3.82309 |
| 1976 | 4.01028 |
| 1975 | 4.24577 |
| 1974 | 4.185 |
| 1973 | 4.17121 |
| 1972 | 4.18379 |
| 1971 | 4.13256 |
| 1970 | 4.89659 |
| 1969 | 4.98125 |
| 1968 | 4.92067 |
| 1967 | 4.84631 |
| 1966 | 4.7276 |
| 1965 | 4.63112 |
| 1964 | 4.53375 |
| 1963 | 4.40962 |
| 1962 | 4.27149 |
| 1961 | 4.23195 |
| 1960 | - |