| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 2.91644 |
| 2021 | 2.88023 |
| 2020 | 2.84936 |
| 2019 | 2.8128 |
| 2018 | 2.76487 |
| 2017 | 2.70593 |
| 2016 | 2.64515 |
| 2015 | 2.5841 |
| 2014 | 2.52065 |
| 2013 | 2.45964 |
| 2012 | 2.40129 |
| 2011 | 2.34866 |
| 2010 | 2.30575 |
| 2009 | 2.2729 |
| 2008 | 2.24725 |
| 2007 | 2.2257 |
| 2006 | 2.2073 |
| 2005 | 2.21562 |
| 2004 | 2.2778 |
| 2003 | 2.36245 |
| 2002 | 2.43265 |
| 2001 | 2.48769 |
| 2000 | 2.52751 |
| 1999 | 2.55175 |
| 1998 | 2.539 |
| 1997 | 2.49583 |
| 1996 | 2.452 |
| 1995 | 2.40921 |
| 1994 | 2.3668 |
| 1993 | 2.32261 |
| 1992 | 2.274 |
| 1991 | 2.22793 |
| 1990 | 2.18439 |
| 1989 | 2.14323 |
| 1988 | 2.1033 |
| 1987 | 2.06355 |
| 1986 | 2.02509 |
| 1985 | 1.98781 |
| 1984 | 1.95184 |
| 1983 | 1.91783 |
| 1982 | 1.8863 |
| 1981 | 1.85687 |
| 1980 | 1.8294 |
| 1979 | 1.80388 |
| 1978 | 1.77991 |
| 1977 | 1.75812 |
| 1976 | 1.73795 |
| 1975 | 1.72012 |
| 1974 | 1.70458 |
| 1973 | 1.691 |
| 1972 | 1.67909 |
| 1971 | 1.66805 |
| 1970 | 1.65846 |
| 1969 | 1.6503 |
| 1968 | 1.64368 |
| 1967 | 1.63883 |
| 1966 | 1.6348 |
| 1965 | 1.63243 |
| 1964 | 1.63183 |
| 1963 | 1.63292 |
| 1962 | 1.63555 |
| 1961 | 1.63899 |
| 1960 | 1.64332 |