| 年份 | 纳米比亚 |
|---|---|
| 2023 | - |
| 2022 | 1.44636 |
| 2021 | 1.63586 |
| 2020 | 1.72031 |
| 2019 | 1.68847 |
| 2018 | 1.72516 |
| 2017 | 1.757 |
| 2016 | 1.76503 |
| 2015 | 1.7546 |
| 2014 | 1.73094 |
| 2013 | 1.69447 |
| 2012 | 1.63406 |
| 2011 | 1.56298 |
| 2010 | 1.50474 |
| 2009 | 1.4303 |
| 2008 | 1.3363 |
| 2007 | 1.24732 |
| 2006 | 1.19984 |
| 2005 | 1.20234 |
| 2004 | 1.24422 |
| 2003 | 1.41434 |
| 2002 | 1.71559 |
| 2001 | 2.02758 |
| 2000 | 2.27195 |
| 1999 | 2.40884 |
| 1998 | 2.49115 |
| 1997 | 2.58297 |
| 1996 | 2.7461 |
| 1995 | 2.96632 |
| 1994 | 3.16914 |
| 1993 | 3.24085 |
| 1992 | 3.20258 |
| 1991 | 3.34769 |
| 1990 | 6.09436 |
| 1989 | 6.42211 |
| 1988 | 3.58338 |
| 1987 | 3.26537 |
| 1986 | 3.12257 |
| 1985 | 2.90615 |
| 1984 | 2.75997 |
| 1983 | 2.70447 |
| 1982 | 1.8191 |
| 1981 | 1.16127 |
| 1980 | 1.93041 |
| 1979 | 1.61226 |
| 1978 | 1.70378 |
| 1977 | 2.65548 |
| 1976 | 2.84183 |
| 1975 | 3.06754 |
| 1974 | 3.00594 |
| 1973 | 2.991 |
| 1972 | 2.994 |
| 1971 | 2.94224 |
| 1970 | 2.90282 |
| 1969 | 2.83059 |
| 1968 | 2.75565 |
| 1967 | 2.66779 |
| 1966 | 2.54098 |
| 1965 | 2.43608 |
| 1964 | 2.31551 |
| 1963 | 2.18352 |
| 1962 | 2.0382 |
| 1961 | 1.88709 |
| 1960 | - |