| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 38.2 |
| 2020 | 39.6 |
| 2019 | 41.1 |
| 2018 | 42.4 |
| 2017 | 43.5 |
| 2016 | 47.3 |
| 2015 | 49.3 |
| 2014 | 52.2 |
| 2013 | 54.3 |
| 2012 | 59.6 |
| 2011 | 66 |
| 2010 | 67.3 |
| 2009 | 70.7 |
| 2008 | 73.5 |
| 2007 | 73.1 |
| 2006 | 73 |
| 2005 | 75.2 |
| 2004 | 77.5 |
| 2003 | 76.6 |
| 2002 | 75.7 |
| 2001 | 76.7 |
| 2000 | 77.6 |
| 1999 | 76.7 |
| 1998 | 75.3 |
| 1997 | 73.3 |
| 1996 | 69.5 |
| 1995 | 69.8 |
| 1994 | 64.3 |
| 1993 | 59.3 |
| 1992 | 54.8 |
| 1991 | 51.3 |
| 1990 | 49.4 |
| 1989 | 49.4 |
| 1988 | 51.2 |
| 1987 | 54.3 |
| 1986 | 57.8 |
| 1985 | 61.3 |
| 1984 | 64.6 |
| 1983 | 67.9 |
| 1982 | 71.3 |
| 1981 | 74.9 |
| 1980 | 79.2 |
| 1979 | 83.7 |
| 1978 | 88.8 |
| 1977 | 94.4 |
| 1976 | 100.4 |
| 1975 | 106.4 |
| 1974 | 112.2 |
| 1973 | 117.1 |
| 1972 | 121.8 |
| 1971 | 126.4 |
| 1970 | 131.2 |
| 1969 | 136 |
| 1968 | 140.5 |
| 1967 | 144.7 |
| 1966 | 148.6 |
| 1965 | 152.3 |
| 1964 | 155.9 |
| 1963 | 159.9 |
| 1962 | 164.5 |
| 1961 | 169.1 |
| 1960 | 174.8 |