| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 1.57007 |
| 2021 | 1.52756 |
| 2020 | 1.49594 |
| 2019 | 1.47739 |
| 2018 | 1.47184 |
| 2017 | 1.47634 |
| 2016 | 1.47629 |
| 2015 | 1.46425 |
| 2014 | 1.44906 |
| 2013 | 1.43585 |
| 2012 | 1.42435 |
| 2011 | 1.41236 |
| 2010 | 1.399 |
| 2009 | 1.38304 |
| 2008 | 1.36343 |
| 2007 | 1.34183 |
| 2006 | 1.31925 |
| 2005 | 1.29837 |
| 2004 | 1.28212 |
| 2003 | 1.26254 |
| 2002 | 1.23243 |
| 2001 | 1.19375 |
| 2000 | 1.14948 |
| 1999 | 1.10061 |
| 1998 | 1.05813 |
| 1997 | 1.02532 |
| 1996 | 0.993995 |
| 1995 | 0.963975 |
| 1994 | 0.935141 |
| 1993 | 0.908403 |
| 1992 | 0.882639 |
| 1991 | 0.859761 |
| 1990 | 0.839424 |
| 1989 | 0.821041 |
| 1988 | 0.803041 |
| 1987 | 0.786497 |
| 1986 | 0.771702 |
| 1985 | 0.757863 |
| 1984 | 0.744874 |
| 1983 | 0.733276 |
| 1982 | 0.722212 |
| 1981 | 0.711387 |
| 1980 | 0.701972 |
| 1979 | 0.692923 |
| 1978 | 0.683997 |
| 1977 | 0.67626 |
| 1976 | 0.668845 |
| 1975 | 0.662606 |
| 1974 | 0.657657 |
| 1973 | 0.652503 |
| 1972 | 0.649265 |
| 1971 | 0.646878 |
| 1970 | 0.64453 |
| 1969 | 0.643277 |
| 1968 | 0.642388 |
| 1967 | 0.642853 |
| 1966 | 0.643823 |
| 1965 | 0.644966 |
| 1964 | 0.646267 |
| 1963 | 0.646581 |
| 1962 | 0.646438 |
| 1961 | 0.647249 |
| 1960 | 0.649805 |