| 年份 | 萨摩亚 |
|---|---|
| 2023 | - |
| 2022 | 0.928355 |
| 2021 | 0.942255 |
| 2020 | 0.487545 |
| 2019 | 0.0156826 |
| 2018 | -0.146275 |
| 2017 | -0.224221 |
| 2016 | -0.273079 |
| 2015 | -0.339656 |
| 2014 | -0.320447 |
| 2013 | -0.314279 |
| 2012 | -0.279958 |
| 2011 | -0.248479 |
| 2010 | -0.329498 |
| 2009 | -0.374156 |
| 2008 | -0.41072 |
| 2007 | -0.529916 |
| 2006 | -0.724704 |
| 2005 | -0.826101 |
| 2004 | -0.780001 |
| 2003 | -0.678766 |
| 2002 | 0.0122114 |
| 2001 | 1.23862 |
| 2000 | 1.39448 |
| 1999 | 1.41929 |
| 1998 | 1.44488 |
| 1997 | 1.4425 |
| 1996 | 1.44768 |
| 1995 | 1.45008 |
| 1994 | 1.42767 |
| 1993 | 1.33469 |
| 1992 | 0.921229 |
| 1991 | 0.308037 |
| 1990 | 0.17685 |
| 1989 | 0.25882 |
| 1988 | 0.406459 |
| 1987 | 0.246372 |
| 1986 | -0.0935228 |
| 1985 | -0.155677 |
| 1984 | -0.0989413 |
| 1983 | 0.0339117 |
| 1982 | 0.450419 |
| 1981 | 0.872596 |
| 1980 | 0.95543 |
| 1979 | 1.01721 |
| 1978 | 1.10443 |
| 1977 | 1.58679 |
| 1976 | 2.21803 |
| 1975 | 2.34998 |
| 1974 | 2.13983 |
| 1973 | 1.90494 |
| 1972 | 2.23249 |
| 1971 | 2.85312 |
| 1970 | 2.89794 |
| 1969 | 2.92241 |
| 1968 | 3.02543 |
| 1967 | 3.15086 |
| 1966 | 2.84137 |
| 1965 | 2.92036 |
| 1964 | 2.94893 |
| 1963 | 3.09092 |
| 1962 | 3.21657 |
| 1961 | 3.34212 |
| 1960 | - |