| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | 1.44755 |
| 2021 | 1.4798 |
| 2020 | 1.52229 |
| 2019 | 1.53864 |
| 2018 | 1.51431 |
| 2017 | 1.48046 |
| 2016 | 1.44923 |
| 2015 | 1.43438 |
| 2014 | 1.48123 |
| 2013 | 1.55577 |
| 2012 | 1.59768 |
| 2011 | 1.59947 |
| 2010 | 1.56464 |
| 2009 | 1.52911 |
| 2008 | 1.50641 |
| 2007 | 1.48928 |
| 2006 | 1.48999 |
| 2005 | 1.50135 |
| 2004 | 1.51061 |
| 2003 | 1.51191 |
| 2002 | 1.50536 |
| 2001 | 1.48206 |
| 2000 | 1.447 |
| 1999 | 1.41468 |
| 1998 | 1.38807 |
| 1997 | 1.3723 |
| 1996 | 1.37172 |
| 1995 | 1.37751 |
| 1994 | 1.38368 |
| 1993 | 1.37621 |
| 1992 | 1.33709 |
| 1991 | 1.27213 |
| 1990 | 1.20401 |
| 1989 | 1.14906 |
| 1988 | 1.11362 |
| 1987 | 1.09813 |
| 1986 | 1.09412 |
| 1985 | 1.09082 |
| 1984 | 1.07636 |
| 1983 | 1.04977 |
| 1982 | 1.02027 |
| 1981 | 0.987259 |
| 1980 | 0.954862 |
| 1979 | 0.927138 |
| 1978 | 0.898073 |
| 1977 | 0.869804 |
| 1976 | 0.848825 |
| 1975 | 0.837951 |
| 1974 | 0.834464 |
| 1973 | 0.829782 |
| 1972 | 0.822875 |
| 1971 | 0.81724 |
| 1970 | 0.813109 |
| 1969 | 0.812915 |
| 1968 | 0.815847 |
| 1967 | 0.822747 |
| 1966 | 0.816054 |
| 1965 | 0.79767 |
| 1964 | 0.787462 |
| 1963 | 0.776221 |
| 1962 | 0.767794 |
| 1961 | 0.763959 |
| 1960 | 0.763801 |