| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 4.60984 |
| 2021 | 4.52877 |
| 2020 | 4.43165 |
| 2019 | 4.31181 |
| 2018 | 4.17592 |
| 2017 | 4.03183 |
| 2016 | 3.91512 |
| 2015 | 3.83946 |
| 2014 | 3.78864 |
| 2013 | 3.76007 |
| 2012 | 3.74614 |
| 2011 | 3.73849 |
| 2010 | 3.72778 |
| 2009 | 3.7048 |
| 2008 | 3.66594 |
| 2007 | 3.61282 |
| 2006 | 3.54536 |
| 2005 | 3.47115 |
| 2004 | 3.42343 |
| 2003 | 3.42422 |
| 2002 | 3.48325 |
| 2001 | 3.61021 |
| 2000 | 3.80189 |
| 1999 | 4.00914 |
| 1998 | 4.12411 |
| 1997 | 4.13206 |
| 1996 | 4.1047 |
| 1995 | 4.07256 |
| 1994 | 4.04247 |
| 1993 | 4.01809 |
| 1992 | 3.99698 |
| 1991 | 3.97859 |
| 1990 | 3.95981 |
| 1989 | 3.93997 |
| 1988 | 3.91833 |
| 1987 | 3.89244 |
| 1986 | 3.86349 |
| 1985 | 3.83254 |
| 1984 | 3.79878 |
| 1983 | 3.76024 |
| 1982 | 3.7184 |
| 1981 | 3.67431 |
| 1980 | 3.63007 |
| 1979 | 3.58615 |
| 1978 | 3.54094 |
| 1977 | 3.49519 |
| 1976 | 3.44967 |
| 1975 | 3.40416 |
| 1974 | 3.35896 |
| 1973 | 3.31646 |
| 1972 | 3.27751 |
| 1971 | 3.24121 |
| 1970 | 3.2063 |
| 1969 | 3.17394 |
| 1968 | 3.14407 |
| 1967 | 3.11616 |
| 1966 | 3.09218 |
| 1965 | 3.07228 |
| 1964 | 3.05448 |
| 1963 | 3.03893 |
| 1962 | 3.02609 |
| 1961 | 3.01354 |
| 1960 | 3.00108 |