| 年份 | 纳米比亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 32.3 |
| 2020 | 33.1 |
| 2019 | 33.8 |
| 2018 | 34.5 |
| 2017 | 35.1 |
| 2016 | 35.8 |
| 2015 | 36.5 |
| 2014 | 36.7 |
| 2013 | 39.5 |
| 2012 | 41.9 |
| 2011 | 40.7 |
| 2010 | 40.4 |
| 2009 | 42.4 |
| 2008 | 41.4 |
| 2007 | 41.4 |
| 2006 | 40.9 |
| 2005 | 42.7 |
| 2004 | 46.1 |
| 2003 | 46.8 |
| 2002 | 47.3 |
| 2001 | 48.1 |
| 2000 | 49 |
| 1999 | 50.1 |
| 1998 | 51.1 |
| 1997 | 51.8 |
| 1996 | 51.6 |
| 1995 | 51.1 |
| 1994 | 50.7 |
| 1993 | 50.6 |
| 1992 | 51 |
| 1991 | 51.8 |
| 1990 | 53 |
| 1989 | 54.4 |
| 1988 | 56 |
| 1987 | 57.8 |
| 1986 | 59.9 |
| 1985 | 62 |
| 1984 | 64.2 |
| 1983 | 66.2 |
| 1982 | 67.9 |
| 1981 | 69.2 |
| 1980 | 70.1 |
| 1979 | 70.4 |
| 1978 | 70.4 |
| 1977 | 70.1 |
| 1976 | 69.6 |
| 1975 | 69.1 |
| 1974 | 68.6 |
| 1973 | 68.2 |
| 1972 | 67.8 |
| 1971 | 67.5 |
| 1970 | 67.2 |
| 1969 | 66.9 |
| 1968 | 66.7 |
| 1967 | 66.4 |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |