| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 1.7414 |
| 2021 | 1.68745 |
| 2020 | 1.65024 |
| 2019 | 1.62992 |
| 2018 | 1.62546 |
| 2017 | 1.63161 |
| 2016 | 1.62918 |
| 2015 | 1.61094 |
| 2014 | 1.58777 |
| 2013 | 1.56443 |
| 2012 | 1.54357 |
| 2011 | 1.52643 |
| 2010 | 1.51046 |
| 2009 | 1.49258 |
| 2008 | 1.47105 |
| 2007 | 1.44576 |
| 2006 | 1.41742 |
| 2005 | 1.38653 |
| 2004 | 1.35266 |
| 2003 | 1.31275 |
| 2002 | 1.26625 |
| 2001 | 1.21512 |
| 2000 | 1.16127 |
| 1999 | 1.1061 |
| 1998 | 1.0647 |
| 1997 | 1.0389 |
| 1996 | 1.01456 |
| 1995 | 0.992165 |
| 1994 | 0.970597 |
| 1993 | 0.950001 |
| 1992 | 0.92966 |
| 1991 | 0.911565 |
| 1990 | 0.895433 |
| 1989 | 0.881081 |
| 1988 | 0.868482 |
| 1987 | 0.856217 |
| 1986 | 0.844529 |
| 1985 | 0.834184 |
| 1984 | 0.824423 |
| 1983 | 0.81425 |
| 1982 | 0.804974 |
| 1981 | 0.797208 |
| 1980 | 0.789217 |
| 1979 | 0.781732 |
| 1978 | 0.775623 |
| 1977 | 0.769495 |
| 1976 | 0.763436 |
| 1975 | 0.757497 |
| 1974 | 0.751732 |
| 1973 | 0.74657 |
| 1972 | 0.743431 |
| 1971 | 0.741867 |
| 1970 | 0.74073 |
| 1969 | 0.741123 |
| 1968 | 0.742327 |
| 1967 | 0.743634 |
| 1966 | 0.745888 |
| 1965 | 0.748369 |
| 1964 | 0.749844 |
| 1963 | 0.750646 |
| 1962 | 0.750434 |
| 1961 | 0.750111 |
| 1960 | 0.750069 |