| 年份 | 美国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 6.05368 |
| 2020 | -13.2351 |
| 2019 | 0.470301 |
| 2018 | 2.80184 |
| 2017 | 4.26804 |
| 2016 | 0.405261 |
| 2015 | 0.271089 |
| 2014 | 3.88365 |
| 2013 | 2.97141 |
| 2012 | 4.0135 |
| 2011 | 7.16646 |
| 2010 | 12.8828 |
| 2009 | -8.29435 |
| 2008 | 5.7817 |
| 2007 | 8.75921 |
| 2006 | 9.46544 |
| 2005 | 6.9416 |
| 2004 | 9.63718 |
| 2003 | 2.10304 |
| 2002 | -1.96188 |
| 2001 | -5.58207 |
| 2000 | 8.31115 |
| 1999 | 4.98363 |
| 1998 | 2.33573 |
| 1997 | 11.9096 |
| 1996 | 8.17655 |
| 1995 | 10.2782 |
| 1994 | 8.83606 |
| 1993 | 3.26473 |
| 1992 | 6.92727 |
| 1991 | 6.61425 |
| 1990 | 8.82199 |
| 1989 | 11.5768 |
| 1988 | 16.2123 |
| 1987 | 10.9288 |
| 1986 | 7.66216 |
| 1985 | 3.35066 |
| 1984 | 8.15288 |
| 1983 | -2.59117 |
| 1982 | -7.65703 |
| 1981 | 1.21877 |
| 1980 | 10.7673 |
| 1979 | 9.90269 |
| 1978 | 10.5553 |
| 1977 | 2.4036 |
| 1976 | 4.3668 |
| 1975 | -0.640481 |
| 1974 | 7.9425 |
| 1973 | 18.819 |
| 1972 | 7.79452 |
| 1971 | 1.7329 |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |