| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | 1.70248 |
| 2021 | 1.69847 |
| 2020 | 1.75127 |
| 2019 | 1.76749 |
| 2018 | 1.74495 |
| 2017 | 1.73101 |
| 2016 | 1.70171 |
| 2015 | 1.67177 |
| 2014 | 1.70824 |
| 2013 | 1.76601 |
| 2012 | 1.75719 |
| 2011 | 1.74201 |
| 2010 | 1.7172 |
| 2009 | 1.665 |
| 2008 | 1.62401 |
| 2007 | 1.60028 |
| 2006 | 1.60908 |
| 2005 | 1.63222 |
| 2004 | 1.64369 |
| 2003 | 1.64209 |
| 2002 | 1.63038 |
| 2001 | 1.60488 |
| 2000 | 1.57551 |
| 1999 | 1.54589 |
| 1998 | 1.50513 |
| 1997 | 1.45964 |
| 1996 | 1.42275 |
| 1995 | 1.39341 |
| 1994 | 1.38069 |
| 1993 | 1.38089 |
| 1992 | 1.37451 |
| 1991 | 1.35094 |
| 1990 | 1.29804 |
| 1989 | 1.22429 |
| 1988 | 1.16079 |
| 1987 | 1.12098 |
| 1986 | 1.10632 |
| 1985 | 1.10399 |
| 1984 | 1.0893 |
| 1983 | 1.05694 |
| 1982 | 1.01406 |
| 1981 | 0.982806 |
| 1980 | 0.967677 |
| 1979 | 0.955215 |
| 1978 | 0.948734 |
| 1977 | 0.947482 |
| 1976 | 0.948881 |
| 1975 | 0.949246 |
| 1974 | 0.940883 |
| 1973 | 0.930865 |
| 1972 | 0.920376 |
| 1971 | 0.909888 |
| 1970 | 0.904224 |
| 1969 | 0.901479 |
| 1968 | 0.900701 |
| 1967 | 0.905074 |
| 1966 | 0.900947 |
| 1965 | 0.891365 |
| 1964 | 0.889997 |
| 1963 | 0.892307 |
| 1962 | 0.898488 |
| 1961 | 0.910113 |
| 1960 | 0.928053 |