| 年份 | 不丹 |
|---|---|
| 2023 | - |
| 2022 | 6.52208 |
| 2021 | 6.77741 |
| 2020 | 7.04409 |
| 2019 | 7.36827 |
| 2018 | 7.74911 |
| 2017 | 8.11006 |
| 2016 | 8.43527 |
| 2015 | 8.73184 |
| 2014 | 8.96716 |
| 2013 | 9.14495 |
| 2012 | 9.326 |
| 2011 | 9.55635 |
| 2010 | 9.83627 |
| 2009 | 10.1115 |
| 2008 | 10.3304 |
| 2007 | 10.4746 |
| 2006 | 10.5591 |
| 2005 | 10.6768 |
| 2004 | 10.9397 |
| 2003 | 11.3177 |
| 2002 | 11.7539 |
| 2001 | 12.2467 |
| 2000 | 12.7664 |
| 1999 | 13.2994 |
| 1998 | 13.8071 |
| 1997 | 14.2672 |
| 1996 | 14.6911 |
| 1995 | 15.0728 |
| 1994 | 15.4198 |
| 1993 | 15.7326 |
| 1992 | 16.0306 |
| 1991 | 16.2831 |
| 1990 | 16.49 |
| 1989 | 16.6706 |
| 1988 | 16.8392 |
| 1987 | 16.9952 |
| 1986 | 17.139 |
| 1985 | 17.2733 |
| 1984 | 17.3963 |
| 1983 | 17.5013 |
| 1982 | 17.5863 |
| 1981 | 17.6522 |
| 1980 | 17.7014 |
| 1979 | 17.734 |
| 1978 | 17.7592 |
| 1977 | 17.7801 |
| 1976 | 17.7939 |
| 1975 | 17.8042 |
| 1974 | 17.8118 |
| 1973 | 17.8109 |
| 1972 | 17.7981 |
| 1971 | 17.7753 |
| 1970 | 17.7422 |
| 1969 | 17.6953 |
| 1968 | 17.6326 |
| 1967 | 17.553 |
| 1966 | 17.4579 |
| 1965 | 17.3536 |
| 1964 | 17.2451 |
| 1963 | 17.1374 |
| 1962 | 17.0384 |
| 1961 | 16.9411 |
| 1960 | 16.8363 |