| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | 3.60214 |
| 2021 | 3.46507 |
| 2020 | 3.36898 |
| 2019 | 3.37352 |
| 2018 | 3.36721 |
| 2017 | 3.32626 |
| 2016 | 3.27724 |
| 2015 | 3.2101 |
| 2014 | 3.13068 |
| 2013 | 3.08795 |
| 2012 | 3.0963 |
| 2011 | 3.10293 |
| 2010 | 3.06301 |
| 2009 | 3.01546 |
| 2008 | 2.98318 |
| 2007 | 2.97426 |
| 2006 | 2.97627 |
| 2005 | 3.00298 |
| 2004 | 3.03695 |
| 2003 | 3.03903 |
| 2002 | 3.02197 |
| 2001 | 3.01876 |
| 2000 | 3.02913 |
| 1999 | 3.05288 |
| 1998 | 3.0956 |
| 1997 | 3.12462 |
| 1996 | 3.10668 |
| 1995 | 3.06571 |
| 1994 | 3.0316 |
| 1993 | 2.99975 |
| 1992 | 2.98527 |
| 1991 | 2.99685 |
| 1990 | 3.01575 |
| 1989 | 3.01752 |
| 1988 | 3.0042 |
| 1987 | 2.97891 |
| 1986 | 2.9231 |
| 1985 | 2.85181 |
| 1984 | 2.77551 |
| 1983 | 2.69735 |
| 1982 | 2.63487 |
| 1981 | 2.58118 |
| 1980 | 2.5263 |
| 1979 | 2.47488 |
| 1978 | 2.42289 |
| 1977 | 2.36657 |
| 1976 | 2.31276 |
| 1975 | 2.25734 |
| 1974 | 2.19279 |
| 1973 | 2.13125 |
| 1972 | 2.0812 |
| 1971 | 2.03614 |
| 1970 | 1.99881 |
| 1969 | 1.97623 |
| 1968 | 1.96696 |
| 1967 | 1.96668 |
| 1966 | 1.97252 |
| 1965 | 1.98435 |
| 1964 | 2.00215 |
| 1963 | 2.02695 |
| 1962 | 2.0576 |
| 1961 | 2.08808 |
| 1960 | 2.11627 |