| 年份 | 汤加 |
|---|---|
| 2023 | - |
| 2022 | 1.01896 |
| 2021 | 1.00401 |
| 2020 | 0.996305 |
| 2019 | 1.03281 |
| 2018 | 1.09069 |
| 2017 | 1.1311 |
| 2016 | 1.15559 |
| 2015 | 1.12256 |
| 2014 | 1.06164 |
| 2013 | 1.02412 |
| 2012 | 1.00052 |
| 2011 | 0.992964 |
| 2010 | 0.995931 |
| 2009 | 1.01201 |
| 2008 | 1.01629 |
| 2007 | 1.00364 |
| 2006 | 0.982502 |
| 2005 | 0.955827 |
| 2004 | 0.93018 |
| 2003 | 0.90922 |
| 2002 | 0.894492 |
| 2001 | 0.893624 |
| 2000 | 0.904253 |
| 1999 | 0.914193 |
| 1998 | 0.918588 |
| 1997 | 0.903803 |
| 1996 | 0.864799 |
| 1995 | 0.819035 |
| 1994 | 0.779123 |
| 1993 | 0.751917 |
| 1992 | 0.738528 |
| 1991 | 0.735184 |
| 1990 | 0.739007 |
| 1989 | 0.738248 |
| 1988 | 0.727945 |
| 1987 | 0.706014 |
| 1986 | 0.667271 |
| 1985 | 0.630883 |
| 1984 | 0.60882 |
| 1983 | 0.594936 |
| 1982 | 0.586201 |
| 1981 | 0.573705 |
| 1980 | 0.554469 |
| 1979 | 0.533561 |
| 1978 | 0.518119 |
| 1977 | 0.510272 |
| 1976 | 0.508678 |
| 1975 | 0.507153 |
| 1974 | 0.503647 |
| 1973 | 0.500452 |
| 1972 | 0.498745 |
| 1971 | 0.499424 |
| 1970 | 0.498212 |
| 1969 | 0.497353 |
| 1968 | 0.49812 |
| 1967 | 0.497447 |
| 1966 | 0.491335 |
| 1965 | 0.483853 |
| 1964 | 0.481227 |
| 1963 | 0.480833 |
| 1962 | 0.482769 |
| 1961 | 0.487305 |
| 1960 | 0.494734 |