年份 | 美国 |
---|---|
2023 | - |
2022 | - |
2021 | 0.165542 |
2020 | 0.083695 |
2019 | 0.131587 |
2018 | 0.19837 |
2017 | 0.182333 |
2016 | 0.135997 |
2015 | 0.15481 |
2014 | 0.226671 |
2013 | 0.279719 |
2012 | 0.365038 |
2011 | 0.576151 |
2010 | 0.463272 |
2009 | 0.328948 |
2008 | 0.69688 |
2007 | 0.249876 |
2006 | 0.275792 |
2005 | 0.265072 |
2004 | 0.321325 |
2003 | 0.154156 |
2002 | 0.151822 |
2001 | 0.212622 |
2000 | 0.140193 |
1999 | 0.127171 |
1998 | 0.162197 |
1997 | 0.182766 |
1996 | 0.196221 |
1995 | 0.185739 |
1994 | 0.0632599 |
1993 | 0.0657599 |
1992 | 0.137242 |
1991 | 0.175651 |
1990 | 0.195194 |
1989 | 0.181418 |
1988 | 0.140726 |
1987 | 0.107592 |
1986 | 0.199445 |
1985 | 0.305577 |
1984 | 0.307097 |
1983 | 0.384582 |
1982 | 0.741094 |
1981 | 0.71839 |
1980 | 0.533324 |
1979 | 0.413817 |
1978 | 0.402225 |
1977 | 0.546537 |
1976 | 0.582522 |
1975 | 0.574744 |
1974 | 0.247654 |
1973 | 0.121739 |
1972 | 0.109536 |
1971 | 0.103469 |
1970 | 0.0930505 |
1969 | - |
1968 | - |
1967 | - |
1966 | - |
1965 | - |
1964 | - |
1963 | - |
1962 | - |
1961 | - |
1960 | - |