| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 31.4 |
| 2020 | 32.9 |
| 2019 | 34 |
| 2018 | 35.3 |
| 2017 | 36.2 |
| 2016 | 39.4 |
| 2015 | 41.3 |
| 2014 | 43.9 |
| 2013 | 46.1 |
| 2012 | 50.6 |
| 2011 | 56.3 |
| 2010 | 57.7 |
| 2009 | 61 |
| 2008 | 63.8 |
| 2007 | 63.9 |
| 2006 | 64.5 |
| 2005 | 67.2 |
| 2004 | 69.8 |
| 2003 | 69 |
| 2002 | 68.6 |
| 2001 | 69.6 |
| 2000 | 70.4 |
| 1999 | 69.4 |
| 1998 | 67.9 |
| 1997 | 65.4 |
| 1996 | 61.6 |
| 1995 | 61.5 |
| 1994 | 56.3 |
| 1993 | 51.2 |
| 1992 | 46.7 |
| 1991 | 43 |
| 1990 | 40.9 |
| 1989 | 40.6 |
| 1988 | 42 |
| 1987 | 44.7 |
| 1986 | 47.7 |
| 1985 | 50.8 |
| 1984 | 53.7 |
| 1983 | 56.6 |
| 1982 | 59.7 |
| 1981 | 63.1 |
| 1980 | 66.9 |
| 1979 | 71.2 |
| 1978 | 76 |
| 1977 | 81.3 |
| 1976 | 87 |
| 1975 | 92.8 |
| 1974 | 98 |
| 1973 | 102.7 |
| 1972 | 107 |
| 1971 | 111.5 |
| 1970 | 115.9 |
| 1969 | 120.4 |
| 1968 | 124.9 |
| 1967 | 128.8 |
| 1966 | 132.5 |
| 1965 | 135.9 |
| 1964 | 139.5 |
| 1963 | 143.4 |
| 1962 | 147.6 |
| 1961 | 152.4 |
| 1960 | 157.6 |