| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 3.10074 |
| 2021 | 3.07858 |
| 2020 | 3.06157 |
| 2019 | 3.0363 |
| 2018 | 2.99063 |
| 2017 | 2.91858 |
| 2016 | 2.81949 |
| 2015 | 2.70636 |
| 2014 | 2.60012 |
| 2013 | 2.51106 |
| 2012 | 2.43928 |
| 2011 | 2.38261 |
| 2010 | 2.34153 |
| 2009 | 2.31398 |
| 2008 | 2.2939 |
| 2007 | 2.27684 |
| 2006 | 2.26176 |
| 2005 | 2.26074 |
| 2004 | 2.28273 |
| 2003 | 2.30784 |
| 2002 | 2.31932 |
| 2001 | 2.31904 |
| 2000 | 2.30798 |
| 1999 | 2.28594 |
| 1998 | 2.25544 |
| 1997 | 2.22146 |
| 1996 | 2.18796 |
| 1995 | 2.15716 |
| 1994 | 2.12866 |
| 1993 | 2.10062 |
| 1992 | 2.07081 |
| 1991 | 2.04276 |
| 1990 | 2.0165 |
| 1989 | 1.99203 |
| 1988 | 1.96867 |
| 1987 | 1.94619 |
| 1986 | 1.92532 |
| 1985 | 1.90606 |
| 1984 | 1.88812 |
| 1983 | 1.87093 |
| 1982 | 1.8551 |
| 1981 | 1.8408 |
| 1980 | 1.82726 |
| 1979 | 1.81551 |
| 1978 | 1.8052 |
| 1977 | 1.79502 |
| 1976 | 1.78596 |
| 1975 | 1.77911 |
| 1974 | 1.77321 |
| 1973 | 1.76826 |
| 1972 | 1.76507 |
| 1971 | 1.76253 |
| 1970 | 1.76055 |
| 1969 | 1.75949 |
| 1968 | 1.75879 |
| 1967 | 1.75807 |
| 1966 | 1.75743 |
| 1965 | 1.75653 |
| 1964 | 1.75495 |
| 1963 | 1.75439 |
| 1962 | 1.75619 |
| 1961 | 1.75877 |
| 1960 | 1.76107 |