| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | 0.88203 |
| 2021 | 0.7417 |
| 2020 | 0.255333 |
| 2019 | -0.292344 |
| 2018 | -0.418496 |
| 2017 | -0.502339 |
| 2016 | -0.62136 |
| 2015 | -0.701984 |
| 2014 | -0.665147 |
| 2013 | -0.609163 |
| 2012 | -0.134867 |
| 2011 | 0.440976 |
| 2010 | 0.454927 |
| 2009 | 0.428884 |
| 2008 | 0.507411 |
| 2007 | 0.607437 |
| 2006 | 0.652026 |
| 2005 | 0.685117 |
| 2004 | 0.723009 |
| 2003 | 0.707393 |
| 2002 | 0.695611 |
| 2001 | 0.717424 |
| 2000 | 0.726874 |
| 1999 | 0.757985 |
| 1998 | 0.798433 |
| 1997 | 0.591049 |
| 1996 | 0.362438 |
| 1995 | 0.385712 |
| 1994 | 0.382797 |
| 1993 | 0.370992 |
| 1992 | 0.394583 |
| 1991 | 0.42737 |
| 1990 | 0.496434 |
| 1989 | 0.58456 |
| 1988 | 0.701471 |
| 1987 | 0.820835 |
| 1986 | 1.04486 |
| 1985 | 1.05122 |
| 1984 | 1.07184 |
| 1983 | 1.07868 |
| 1982 | 1.11459 |
| 1981 | 1.17114 |
| 1980 | 1.24934 |
| 1979 | 1.33033 |
| 1978 | 1.43982 |
| 1977 | 1.63656 |
| 1976 | 1.68483 |
| 1975 | 1.72976 |
| 1974 | 1.67853 |
| 1973 | 1.62971 |
| 1972 | 1.69609 |
| 1971 | 1.77689 |
| 1970 | 1.88488 |
| 1969 | 2.01038 |
| 1968 | 2.21589 |
| 1967 | 3.33684 |
| 1966 | 4.75068 |
| 1965 | 4.87671 |
| 1964 | 4.92269 |
| 1963 | 4.93255 |
| 1962 | 4.95516 |
| 1961 | 4.99362 |
| 1960 | - |