| 年份 | 汤加  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 3.81377 | 
| 2021 | 3.64611 | 
| 2020 | 3.45443 | 
| 2019 | 3.30519 | 
| 2018 | 3.21455 | 
| 2017 | 3.14895 | 
| 2016 | 3.08283 | 
| 2015 | 3.02277 | 
| 2014 | 2.96809 | 
| 2013 | 2.94924 | 
| 2012 | 2.92923 | 
| 2011 | 2.89846 | 
| 2010 | 2.83799 | 
| 2009 | 2.75296 | 
| 2008 | 2.68731 | 
| 2007 | 2.66313 | 
| 2006 | 2.66361 | 
| 2005 | 2.67445 | 
| 2004 | 2.67333 | 
| 2003 | 2.64466 | 
| 2002 | 2.60854 | 
| 2001 | 2.5979 | 
| 2000 | 2.62358 | 
| 1999 | 2.68472 | 
| 1998 | 2.78292 | 
| 1997 | 2.88124 | 
| 1996 | 2.92384 | 
| 1995 | 2.90546 | 
| 1994 | 2.86599 | 
| 1993 | 2.83057 | 
| 1992 | 2.81613 | 
| 1991 | 2.83315 | 
| 1990 | 2.86303 | 
| 1989 | 2.88369 | 
| 1988 | 2.8926 | 
| 1987 | 2.88805 | 
| 1986 | 2.85348 | 
| 1985 | 2.7942 | 
| 1984 | 2.7341 | 
| 1983 | 2.68635 | 
| 1982 | 2.66427 | 
| 1981 | 2.66479 | 
| 1980 | 2.66287 | 
| 1979 | 2.6394 | 
| 1978 | 2.59263 | 
| 1977 | 2.52691 | 
| 1976 | 2.44885 | 
| 1975 | 2.36776 | 
| 1974 | 2.29557 | 
| 1973 | 2.2375 | 
| 1972 | 2.19033 | 
| 1971 | 2.1483 | 
| 1970 | 2.10756 | 
| 1969 | 2.07402 | 
| 1968 | 2.04718 | 
| 1967 | 2.02422 | 
| 1966 | 2.01399 | 
| 1965 | 2.01418 | 
| 1964 | 2.0227 | 
| 1963 | 2.0346 | 
| 1962 | 2.05245 | 
| 1961 | 2.07701 | 
| 1960 | 2.099 |