| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | 1.01518 |
| 2021 | 1.0288 |
| 2020 | 1.01454 |
| 2019 | 0.990499 |
| 2018 | 0.969925 |
| 2017 | 0.945927 |
| 2016 | 0.908503 |
| 2015 | 0.885382 |
| 2014 | 0.885172 |
| 2013 | 0.878617 |
| 2012 | 0.848448 |
| 2011 | 0.820074 |
| 2010 | 0.809136 |
| 2009 | 0.787219 |
| 2008 | 0.768463 |
| 2007 | 0.752965 |
| 2006 | 0.739428 |
| 2005 | 0.735754 |
| 2004 | 0.733267 |
| 2003 | 0.729073 |
| 2002 | 0.719957 |
| 2001 | 0.701928 |
| 2000 | 0.682744 |
| 1999 | 0.670215 |
| 1998 | 0.666389 |
| 1997 | 0.67346 |
| 1996 | 0.6687 |
| 1995 | 0.650902 |
| 1994 | 0.635134 |
| 1993 | 0.618353 |
| 1992 | 0.599557 |
| 1991 | 0.579779 |
| 1990 | 0.560006 |
| 1989 | 0.543391 |
| 1988 | 0.541163 |
| 1987 | 0.553637 |
| 1986 | 0.55521 |
| 1985 | 0.529127 |
| 1984 | 0.494984 |
| 1983 | 0.46803 |
| 1982 | 0.446243 |
| 1981 | 0.429772 |
| 1980 | 0.417625 |
| 1979 | 0.41285 |
| 1978 | 0.415511 |
| 1977 | 0.418606 |
| 1976 | 0.40797 |
| 1975 | 0.387148 |
| 1974 | 0.370048 |
| 1973 | 0.359464 |
| 1972 | 0.355779 |
| 1971 | 0.348822 |
| 1970 | 0.341888 |
| 1969 | 0.336142 |
| 1968 | 0.328201 |
| 1967 | 0.324113 |
| 1966 | 0.324719 |
| 1965 | 0.33007 |
| 1964 | 0.33969 |
| 1963 | 0.349697 |
| 1962 | 0.360031 |
| 1961 | 0.372149 |
| 1960 | 0.38624 |