| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 2.791 |
| 2020 | 2.836 |
| 2019 | 2.883 |
| 2018 | 2.903 |
| 2017 | 2.91 |
| 2016 | 2.93 |
| 2015 | 2.942 |
| 2014 | 2.951 |
| 2013 | 2.964 |
| 2012 | 2.981 |
| 2011 | 2.999 |
| 2010 | 3.023 |
| 2009 | 3.045 |
| 2008 | 3.066 |
| 2007 | 3.082 |
| 2006 | 3.091 |
| 2005 | 3.08 |
| 2004 | 3.073 |
| 2003 | 3.11 |
| 2002 | 3.181 |
| 2001 | 3.261 |
| 2000 | 3.312 |
| 1999 | 3.342 |
| 1998 | 3.396 |
| 1997 | 3.458 |
| 1996 | 3.6 |
| 1995 | 3.803 |
| 1994 | 4.009 |
| 1993 | 4.13 |
| 1992 | 4.229 |
| 1991 | 4.339 |
| 1990 | 4.487 |
| 1989 | 4.651 |
| 1988 | 4.852 |
| 1987 | 5.06 |
| 1986 | 5.27 |
| 1985 | 5.427 |
| 1984 | 5.582 |
| 1983 | 5.746 |
| 1982 | 5.933 |
| 1981 | 6.128 |
| 1980 | 6.253 |
| 1979 | 6.358 |
| 1978 | 6.435 |
| 1977 | 6.495 |
| 1976 | 6.556 |
| 1975 | 6.578 |
| 1974 | 6.593 |
| 1973 | 6.593 |
| 1972 | 6.593 |
| 1971 | 6.592 |
| 1970 | 6.617 |
| 1969 | 6.639 |
| 1968 | 6.668 |
| 1967 | 6.678 |
| 1966 | 6.692 |
| 1965 | 6.687 |
| 1964 | 6.688 |
| 1963 | 6.632 |
| 1962 | 6.571 |
| 1961 | 6.597 |
| 1960 | 6.628 |