| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 3.73276 |
| 2021 | 3.59258 |
| 2020 | 3.46928 |
| 2019 | 3.37138 |
| 2018 | 3.30067 |
| 2017 | 3.25441 |
| 2016 | 3.23943 |
| 2015 | 3.24025 |
| 2014 | 3.22871 |
| 2013 | 3.20046 |
| 2012 | 3.15615 |
| 2011 | 3.09738 |
| 2010 | 3.02648 |
| 2009 | 2.95062 |
| 2008 | 2.87548 |
| 2007 | 2.80329 |
| 2006 | 2.73907 |
| 2005 | 2.71399 |
| 2004 | 2.77137 |
| 2003 | 2.88983 |
| 2002 | 3.01403 |
| 2001 | 3.1273 |
| 2000 | 3.22837 |
| 1999 | 3.31503 |
| 1998 | 3.33772 |
| 1997 | 3.30306 |
| 1996 | 3.27089 |
| 1995 | 3.23997 |
| 1994 | 3.20871 |
| 1993 | 3.17608 |
| 1992 | 3.13655 |
| 1991 | 3.09751 |
| 1990 | 3.05956 |
| 1989 | 3.02099 |
| 1988 | 2.98076 |
| 1987 | 2.93926 |
| 1986 | 2.89705 |
| 1985 | 2.85442 |
| 1984 | 2.81178 |
| 1983 | 2.76885 |
| 1982 | 2.72557 |
| 1981 | 2.68318 |
| 1980 | 2.64239 |
| 1979 | 2.60291 |
| 1978 | 2.56622 |
| 1977 | 2.53179 |
| 1976 | 2.49965 |
| 1975 | 2.46951 |
| 1974 | 2.44076 |
| 1973 | 2.41397 |
| 1972 | 2.38953 |
| 1971 | 2.36796 |
| 1970 | 2.34981 |
| 1969 | 2.33436 |
| 1968 | 2.32103 |
| 1967 | 2.30967 |
| 1966 | 2.29947 |
| 1965 | 2.29061 |
| 1964 | 2.28394 |
| 1963 | 2.2787 |
| 1962 | 2.27453 |
| 1961 | 2.27048 |
| 1960 | 2.26688 |