| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 3.74724 |
| 2021 | 3.63254 |
| 2020 | 3.53898 |
| 2019 | 3.47087 |
| 2018 | 3.42507 |
| 2017 | 3.39786 |
| 2016 | 3.38325 |
| 2015 | 3.36898 |
| 2014 | 3.34158 |
| 2013 | 3.29225 |
| 2012 | 3.2181 |
| 2011 | 3.12552 |
| 2010 | 3.02502 |
| 2009 | 2.9283 |
| 2008 | 2.84422 |
| 2007 | 2.77358 |
| 2006 | 2.71535 |
| 2005 | 2.68719 |
| 2004 | 2.71304 |
| 2003 | 2.7757 |
| 2002 | 2.83503 |
| 2001 | 2.87605 |
| 2000 | 2.89972 |
| 1999 | 2.90729 |
| 1998 | 2.89099 |
| 1997 | 2.85968 |
| 1996 | 2.83317 |
| 1995 | 2.81015 |
| 1994 | 2.78788 |
| 1993 | 2.76397 |
| 1992 | 2.73673 |
| 1991 | 2.71137 |
| 1990 | 2.68835 |
| 1989 | 2.66763 |
| 1988 | 2.64736 |
| 1987 | 2.62668 |
| 1986 | 2.60619 |
| 1985 | 2.58517 |
| 1984 | 2.56403 |
| 1983 | 2.54327 |
| 1982 | 2.52338 |
| 1981 | 2.50453 |
| 1980 | 2.48726 |
| 1979 | 2.47135 |
| 1978 | 2.45668 |
| 1977 | 2.44403 |
| 1976 | 2.43325 |
| 1975 | 2.42226 |
| 1974 | 2.41145 |
| 1973 | 2.40332 |
| 1972 | 2.39663 |
| 1971 | 2.39024 |
| 1970 | 2.38552 |
| 1969 | 2.38257 |
| 1968 | 2.38007 |
| 1967 | 2.37878 |
| 1966 | 2.379 |
| 1965 | 2.37887 |
| 1964 | 2.37926 |
| 1963 | 2.38021 |
| 1962 | 2.38007 |
| 1961 | 2.38029 |
| 1960 | 2.38021 |