| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 3.237 |
| 2020 | 3.267 |
| 2019 | 3.315 |
| 2018 | 3.349 |
| 2017 | 3.407 |
| 2016 | 3.483 |
| 2015 | 3.562 |
| 2014 | 3.635 |
| 2013 | 3.707 |
| 2012 | 3.781 |
| 2011 | 3.842 |
| 2010 | 3.889 |
| 2009 | 3.955 |
| 2008 | 4.027 |
| 2007 | 4.093 |
| 2006 | 4.141 |
| 2005 | 4.179 |
| 2004 | 4.206 |
| 2003 | 4.194 |
| 2002 | 4.137 |
| 2001 | 4.072 |
| 2000 | 4.108 |
| 1999 | 4.203 |
| 1998 | 4.328 |
| 1997 | 4.369 |
| 1996 | 4.433 |
| 1995 | 4.447 |
| 1994 | 4.501 |
| 1993 | 4.547 |
| 1992 | 4.583 |
| 1991 | 4.612 |
| 1990 | 4.644 |
| 1989 | 4.691 |
| 1988 | 4.763 |
| 1987 | 4.864 |
| 1986 | 4.989 |
| 1985 | 5.128 |
| 1984 | 5.266 |
| 1983 | 5.385 |
| 1982 | 5.475 |
| 1981 | 5.532 |
| 1980 | 5.553 |
| 1979 | 5.541 |
| 1978 | 5.509 |
| 1977 | 5.471 |
| 1976 | 5.438 |
| 1975 | 5.426 |
| 1974 | 5.449 |
| 1973 | 5.512 |
| 1972 | 5.616 |
| 1971 | 5.761 |
| 1970 | 5.941 |
| 1969 | 6.15 |
| 1968 | 6.371 |
| 1967 | 6.59 |
| 1966 | 6.596 |
| 1965 | 6.662 |
| 1964 | 6.734 |
| 1963 | 6.774 |
| 1962 | 6.804 |
| 1961 | 6.844 |
| 1960 | 6.885 |