| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 34.9 |
| 2020 | 36.3 |
| 2019 | 37.7 |
| 2018 | 39 |
| 2017 | 39.9 |
| 2016 | 43.5 |
| 2015 | 45.4 |
| 2014 | 48.2 |
| 2013 | 50.3 |
| 2012 | 55.2 |
| 2011 | 61.2 |
| 2010 | 62.6 |
| 2009 | 65.9 |
| 2008 | 68.8 |
| 2007 | 68.6 |
| 2006 | 68.8 |
| 2005 | 71.3 |
| 2004 | 73.7 |
| 2003 | 73.1 |
| 2002 | 72.2 |
| 2001 | 73.2 |
| 2000 | 74 |
| 1999 | 73 |
| 1998 | 71.8 |
| 1997 | 69.4 |
| 1996 | 65.6 |
| 1995 | 65.7 |
| 1994 | 60.4 |
| 1993 | 55.4 |
| 1992 | 50.8 |
| 1991 | 47.3 |
| 1990 | 45.3 |
| 1989 | 45.1 |
| 1988 | 46.7 |
| 1987 | 49.6 |
| 1986 | 52.9 |
| 1985 | 56.1 |
| 1984 | 59.3 |
| 1983 | 62.4 |
| 1982 | 65.7 |
| 1981 | 69.3 |
| 1980 | 73.2 |
| 1979 | 77.6 |
| 1978 | 82.6 |
| 1977 | 88 |
| 1976 | 93.9 |
| 1975 | 99.9 |
| 1974 | 105.3 |
| 1973 | 110.1 |
| 1972 | 114.5 |
| 1971 | 119.2 |
| 1970 | 123.7 |
| 1969 | 128.4 |
| 1968 | 132.8 |
| 1967 | 136.9 |
| 1966 | 140.8 |
| 1965 | 144.3 |
| 1964 | 147.9 |
| 1963 | 151.9 |
| 1962 | 156.3 |
| 1961 | 161 |
| 1960 | 166.4 |