| 年份 | 纳米比亚 |
|---|---|
| 2023 | - |
| 2022 | 3.8365 |
| 2021 | 3.8382 |
| 2020 | 3.82213 |
| 2019 | 3.78418 |
| 2018 | 3.72562 |
| 2017 | 3.65487 |
| 2016 | 3.57329 |
| 2015 | 3.48471 |
| 2014 | 3.39437 |
| 2013 | 3.30706 |
| 2012 | 3.2283 |
| 2011 | 3.16167 |
| 2010 | 3.10767 |
| 2009 | 3.06459 |
| 2008 | 3.02958 |
| 2007 | 2.99979 |
| 2006 | 2.97488 |
| 2005 | 2.95513 |
| 2004 | 2.9378 |
| 2003 | 2.9118 |
| 2002 | 2.88451 |
| 2001 | 2.86789 |
| 2000 | 2.84926 |
| 1999 | 2.82275 |
| 1998 | 2.80078 |
| 1997 | 2.77998 |
| 1996 | 2.74541 |
| 1995 | 2.70147 |
| 1994 | 2.65527 |
| 1993 | 2.60997 |
| 1992 | 2.57081 |
| 1991 | 2.54234 |
| 1990 | 2.52346 |
| 1989 | 2.51745 |
| 1988 | 2.52202 |
| 1987 | 2.53394 |
| 1986 | 2.55872 |
| 1985 | 2.59822 |
| 1984 | 2.65334 |
| 1983 | 2.72576 |
| 1982 | 2.8076 |
| 1981 | 2.87975 |
| 1980 | 2.93193 |
| 1979 | 2.96917 |
| 1978 | 2.98351 |
| 1977 | 2.98464 |
| 1976 | 2.99805 |
| 1975 | 3.03172 |
| 1974 | 3.08347 |
| 1973 | 3.15029 |
| 1972 | 3.22989 |
| 1971 | 3.30638 |
| 1970 | 3.36924 |
| 1969 | 3.42176 |
| 1968 | 3.4655 |
| 1967 | 3.49796 |
| 1966 | 3.52405 |
| 1965 | 3.54713 |
| 1964 | 3.56471 |
| 1963 | 3.57457 |
| 1962 | 3.58193 |
| 1961 | 3.59532 |
| 1960 | 3.61892 |