| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 2.2012 |
| 2021 | 2.26451 |
| 2020 | 2.33326 |
| 2019 | 2.43937 |
| 2018 | 2.58331 |
| 2017 | 2.70153 |
| 2016 | 2.78941 |
| 2015 | 2.91959 |
| 2014 | 3.06831 |
| 2013 | 3.18451 |
| 2012 | 3.27429 |
| 2011 | 3.35255 |
| 2010 | 3.39339 |
| 2009 | 3.4467 |
| 2008 | 3.51959 |
| 2007 | 3.59224 |
| 2006 | 3.8706 |
| 2005 | 5.74781 |
| 2004 | 6.31242 |
| 2003 | 6.46037 |
| 2002 | 6.62211 |
| 2001 | 6.78595 |
| 2000 | 6.95788 |
| 1999 | 6.66822 |
| 1998 | 6.12664 |
| 1997 | 6.03813 |
| 1996 | 6.24798 |
| 1995 | 5.61729 |
| 1994 | 4.54513 |
| 1993 | -0.194965 |
| 1992 | 0.651708 |
| 1991 | 6.25581 |
| 1990 | 7.2216 |
| 1989 | 7.50887 |
| 1988 | 7.60655 |
| 1987 | 7.70348 |
| 1986 | 7.77103 |
| 1985 | 7.82939 |
| 1984 | 7.92942 |
| 1983 | 7.97378 |
| 1982 | 8.04522 |
| 1981 | 8.12012 |
| 1980 | 8.21702 |
| 1979 | 8.29498 |
| 1978 | 8.35767 |
| 1977 | 8.36202 |
| 1976 | 8.40575 |
| 1975 | 8.40243 |
| 1974 | 8.42035 |
| 1973 | 8.42664 |
| 1972 | 8.45765 |
| 1971 | 8.45633 |
| 1970 | 8.45768 |
| 1969 | 8.44923 |
| 1968 | 8.41231 |
| 1967 | 8.39726 |
| 1966 | 8.33582 |
| 1965 | 8.29125 |
| 1964 | 8.22874 |
| 1963 | 8.20351 |
| 1962 | 8.06232 |
| 1961 | 7.89884 |
| 1960 | - |