| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 1.99837 |
| 2021 | 1.96997 |
| 2020 | 1.94059 |
| 2019 | 1.89539 |
| 2018 | 1.84317 |
| 2017 | 1.78706 |
| 2016 | 1.73276 |
| 2015 | 1.68682 |
| 2014 | 1.64929 |
| 2013 | 1.60388 |
| 2012 | 1.55004 |
| 2011 | 1.5019 |
| 2010 | 1.4548 |
| 2009 | 1.4095 |
| 2008 | 1.38999 |
| 2007 | 1.39649 |
| 2006 | 1.40834 |
| 2005 | 1.4248 |
| 2004 | 1.4464 |
| 2003 | 1.47398 |
| 2002 | 1.50558 |
| 2001 | 1.53645 |
| 2000 | 1.56294 |
| 1999 | 1.58504 |
| 1998 | 1.60425 |
| 1997 | 1.62013 |
| 1996 | 1.63271 |
| 1995 | 1.64232 |
| 1994 | 1.6467 |
| 1993 | 1.6432 |
| 1992 | 1.63531 |
| 1991 | 1.62981 |
| 1990 | 1.63559 |
| 1989 | 1.65643 |
| 1988 | 1.69316 |
| 1987 | 1.74029 |
| 1986 | 1.77874 |
| 1985 | 1.79382 |
| 1984 | 1.78781 |
| 1983 | 1.76165 |
| 1982 | 1.71441 |
| 1981 | 1.66328 |
| 1980 | 1.61663 |
| 1979 | 1.5676 |
| 1978 | 1.51787 |
| 1977 | 1.47377 |
| 1976 | 1.43607 |
| 1975 | 1.40429 |
| 1974 | 1.38061 |
| 1973 | 1.36787 |
| 1972 | 1.37555 |
| 1971 | 1.41974 |
| 1970 | 1.47937 |
| 1969 | 1.53404 |
| 1968 | 1.59609 |
| 1967 | 1.65838 |
| 1966 | 1.69882 |
| 1965 | 1.70415 |
| 1964 | 1.69097 |
| 1963 | 1.65525 |
| 1962 | 1.59244 |
| 1961 | 1.53939 |
| 1960 | 1.52367 |