| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | 5.42867 |
| 2021 | 5.37726 |
| 2020 | 5.32434 |
| 2019 | 5.26281 |
| 2018 | 5.23956 |
| 2017 | 5.26941 |
| 2016 | 5.29538 |
| 2015 | 5.36584 |
| 2014 | 5.47799 |
| 2013 | 5.54953 |
| 2012 | 5.55431 |
| 2011 | 5.54175 |
| 2010 | 5.47704 |
| 2009 | 5.28318 |
| 2008 | 5.07065 |
| 2007 | 4.88167 |
| 2006 | 4.73737 |
| 2005 | 4.65058 |
| 2004 | 4.59652 |
| 2003 | 4.55271 |
| 2002 | 4.50458 |
| 2001 | 4.43657 |
| 2000 | 4.36583 |
| 1999 | 4.31153 |
| 1998 | 4.29147 |
| 1997 | 4.298 |
| 1996 | 4.32211 |
| 1995 | 4.33902 |
| 1994 | 4.32459 |
| 1993 | 4.3071 |
| 1992 | 4.31274 |
| 1991 | 4.33549 |
| 1990 | 4.36304 |
| 1989 | 4.3735 |
| 1988 | 4.32609 |
| 1987 | 4.23898 |
| 1986 | 4.20651 |
| 1985 | 4.24484 |
| 1984 | 4.31328 |
| 1983 | 4.40061 |
| 1982 | 4.46668 |
| 1981 | 4.47945 |
| 1980 | 4.46166 |
| 1979 | 4.4372 |
| 1978 | 4.40757 |
| 1977 | 4.38237 |
| 1976 | 4.37588 |
| 1975 | 4.38738 |
| 1974 | 4.39339 |
| 1973 | 4.39046 |
| 1972 | 4.38444 |
| 1971 | 4.36583 |
| 1970 | 4.33908 |
| 1969 | 4.31111 |
| 1968 | 4.27864 |
| 1967 | 4.24262 |
| 1966 | 4.19839 |
| 1965 | 4.14511 |
| 1964 | 4.09153 |
| 1963 | 4.0427 |
| 1962 | 4 |
| 1961 | 3.96306 |
| 1960 | 3.92673 |