| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | 1.15168 |
| 2021 | 1.10495 |
| 2020 | 1.06874 |
| 2019 | 1.03091 |
| 2018 | 1.0116 |
| 2017 | 1.00843 |
| 2016 | 1.00479 |
| 2015 | 1.00195 |
| 2014 | 1.00132 |
| 2013 | 1.00397 |
| 2012 | 1.00984 |
| 2011 | 1.01685 |
| 2010 | 1.02323 |
| 2009 | 1.0296 |
| 2008 | 1.03637 |
| 2007 | 1.04257 |
| 2006 | 1.04768 |
| 2005 | 1.05105 |
| 2004 | 1.05012 |
| 2003 | 1.04271 |
| 2002 | 1.03209 |
| 2001 | 1.0264 |
| 2000 | 1.02993 |
| 1999 | 1.04158 |
| 1998 | 1.06216 |
| 1997 | 1.08705 |
| 1996 | 1.10417 |
| 1995 | 1.10594 |
| 1994 | 1.09381 |
| 1993 | 1.06753 |
| 1992 | 1.02901 |
| 1991 | 0.988219 |
| 1990 | 0.952912 |
| 1989 | 0.92248 |
| 1988 | 0.893696 |
| 1987 | 0.868813 |
| 1986 | 0.849245 |
| 1985 | 0.834923 |
| 1984 | 0.827145 |
| 1983 | 0.829847 |
| 1982 | 0.842551 |
| 1981 | 0.86414 |
| 1980 | 0.897782 |
| 1979 | 0.945104 |
| 1978 | 1.00715 |
| 1977 | 1.07966 |
| 1976 | 1.14927 |
| 1975 | 1.20266 |
| 1974 | 1.23472 |
| 1973 | 1.24127 |
| 1972 | 1.22668 |
| 1971 | 1.20958 |
| 1970 | 1.20372 |
| 1969 | 1.21402 |
| 1968 | 1.24724 |
| 1967 | 1.29969 |
| 1966 | 1.35175 |
| 1965 | 1.39149 |
| 1964 | 1.42982 |
| 1963 | 1.46889 |
| 1962 | 1.49706 |
| 1961 | 1.51835 |
| 1960 | 1.537 |