| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 9.05685 |
| 2021 | 8.7336 |
| 2020 | 8.45893 |
| 2019 | 8.2306 |
| 2018 | 8.01832 |
| 2017 | 7.79229 |
| 2016 | 7.58916 |
| 2015 | 7.39209 |
| 2014 | 7.15512 |
| 2013 | 6.91733 |
| 2012 | 6.70784 |
| 2011 | 6.5391 |
| 2010 | 6.4138 |
| 2009 | 6.32322 |
| 2008 | 6.2484 |
| 2007 | 6.17453 |
| 2006 | 6.09752 |
| 2005 | 6.00412 |
| 2004 | 5.87854 |
| 2003 | 5.74184 |
| 2002 | 5.62222 |
| 2001 | 5.52287 |
| 2000 | 5.44526 |
| 1999 | 5.39231 |
| 1998 | 5.36086 |
| 1997 | 5.34893 |
| 1996 | 5.3547 |
| 1995 | 5.37213 |
| 1994 | 5.39996 |
| 1993 | 5.43692 |
| 1992 | 5.48244 |
| 1991 | 5.52938 |
| 1990 | 5.58041 |
| 1989 | 5.6763 |
| 1988 | 5.8172 |
| 1987 | 5.99548 |
| 1986 | 6.21674 |
| 1985 | 6.44558 |
| 1984 | 6.61991 |
| 1983 | 6.73462 |
| 1982 | 6.804 |
| 1981 | 6.82165 |
| 1980 | 6.82779 |
| 1979 | 6.83095 |
| 1978 | 6.8385 |
| 1977 | 6.85088 |
| 1976 | 6.86288 |
| 1975 | 6.87043 |
| 1974 | 6.87188 |
| 1973 | 6.86549 |
| 1972 | 6.84802 |
| 1971 | 6.82137 |
| 1970 | 6.78841 |
| 1969 | 6.74645 |
| 1968 | 6.69297 |
| 1967 | 6.63148 |
| 1966 | 6.56297 |
| 1965 | 6.49158 |
| 1964 | 6.41787 |
| 1963 | 6.3381 |
| 1962 | 6.25497 |
| 1961 | 6.17271 |
| 1960 | 6.09094 |