| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 4.97537 |
| 2021 | 4.77943 |
| 2020 | 4.60517 |
| 2019 | 4.45547 |
| 2018 | 4.33444 |
| 2017 | 4.23538 |
| 2016 | 4.15251 |
| 2015 | 4.07992 |
| 2014 | 4.01178 |
| 2013 | 3.94336 |
| 2012 | 3.87224 |
| 2011 | 3.8021 |
| 2010 | 3.73616 |
| 2009 | 3.67932 |
| 2008 | 3.63356 |
| 2007 | 3.59782 |
| 2006 | 3.56624 |
| 2005 | 3.53225 |
| 2004 | 3.49202 |
| 2003 | 3.44332 |
| 2002 | 3.38839 |
| 2001 | 3.31876 |
| 2000 | 3.23979 |
| 1999 | 3.16307 |
| 1998 | 3.05511 |
| 1997 | 2.92131 |
| 1996 | 2.80388 |
| 1995 | 2.70551 |
| 1994 | 2.62628 |
| 1993 | 2.6064 |
| 1992 | 2.64392 |
| 1991 | 2.69774 |
| 1990 | 2.76217 |
| 1989 | 2.82993 |
| 1988 | 2.9021 |
| 1987 | 2.97722 |
| 1986 | 3.04941 |
| 1985 | 3.11192 |
| 1984 | 3.16569 |
| 1983 | 3.21403 |
| 1982 | 3.25513 |
| 1981 | 3.27758 |
| 1980 | 3.27468 |
| 1979 | 3.25027 |
| 1978 | 3.20255 |
| 1977 | 3.14396 |
| 1976 | 3.10483 |
| 1975 | 3.10825 |
| 1974 | 3.15813 |
| 1973 | 3.26139 |
| 1972 | 3.41397 |
| 1971 | 3.57392 |
| 1970 | 3.664 |
| 1969 | 3.66248 |
| 1968 | 3.58843 |
| 1967 | 3.45611 |
| 1966 | 3.31622 |
| 1965 | 3.20334 |
| 1964 | 3.11761 |
| 1963 | 3.04939 |
| 1962 | 2.99889 |
| 1961 | 2.9647 |
| 1960 | 2.94429 |