| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | 4.64161 |
| 2021 | 4.72831 |
| 2020 | 4.72813 |
| 2019 | 4.62938 |
| 2018 | 4.43942 |
| 2017 | 4.25142 |
| 2016 | 4.0398 |
| 2015 | 3.81366 |
| 2014 | 3.65239 |
| 2013 | 3.5611 |
| 2012 | 3.48188 |
| 2011 | 3.39124 |
| 2010 | 3.32717 |
| 2009 | 3.25433 |
| 2008 | 3.18574 |
| 2007 | 3.13119 |
| 2006 | 3.09688 |
| 2005 | 3.06144 |
| 2004 | 3.01183 |
| 2003 | 2.96722 |
| 2002 | 2.94433 |
| 2001 | 2.94314 |
| 2000 | 2.95728 |
| 1999 | 2.96631 |
| 1998 | 2.95364 |
| 1997 | 2.93199 |
| 1996 | 2.93365 |
| 1995 | 2.97036 |
| 1994 | 3.03266 |
| 1993 | 3.1165 |
| 1992 | 3.1844 |
| 1991 | 3.19676 |
| 1990 | 3.17103 |
| 1989 | 3.14283 |
| 1988 | 3.12885 |
| 1987 | 3.13998 |
| 1986 | 3.18558 |
| 1985 | 3.24599 |
| 1984 | 3.28397 |
| 1983 | 3.29651 |
| 1982 | 3.29003 |
| 1981 | 3.25775 |
| 1980 | 3.21126 |
| 1979 | 3.16789 |
| 1978 | 3.1331 |
| 1977 | 3.10848 |
| 1976 | 3.09009 |
| 1975 | 3.06483 |
| 1974 | 3.01976 |
| 1973 | 2.97042 |
| 1972 | 2.92262 |
| 1971 | 2.8703 |
| 1970 | 2.81608 |
| 1969 | 2.76231 |
| 1968 | 2.71406 |
| 1967 | 2.67244 |
| 1966 | 2.63788 |
| 1965 | 2.6118 |
| 1964 | 2.59142 |
| 1963 | 2.57504 |
| 1962 | 2.56659 |
| 1961 | 2.56713 |
| 1960 | 2.57493 |