| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.308579 |
| 2020 | 0.114304 |
| 2019 | 0.298458 |
| 2018 | 0.413039 |
| 2017 | 0.313804 |
| 2016 | 0.245867 |
| 2015 | 0.335244 |
| 2014 | 0.8881 |
| 2013 | 1.07614 |
| 2012 | 1.28349 |
| 2011 | 1.54521 |
| 2010 | 1.22257 |
| 2009 | 0.899051 |
| 2008 | 1.99029 |
| 2007 | 1.75983 |
| 2006 | 2.22552 |
| 2005 | 2.23061 |
| 2004 | 1.63506 |
| 2003 | 1.28559 |
| 2002 | 1.24409 |
| 2001 | 1.32059 |
| 2000 | 2.03905 |
| 1999 | 1.08728 |
| 1998 | 0.634592 |
| 1997 | 1.44303 |
| 1996 | 1.84232 |
| 1995 | 1.62342 |
| 1994 | 1.91608 |
| 1993 | 2.81112 |
| 1992 | 2.9601 |
| 1991 | 3.02705 |
| 1990 | 5.54446 |
| 1989 | 4.15992 |
| 1988 | 3.1896 |
| 1987 | 4.78169 |
| 1986 | 2.84717 |
| 1985 | 5.60486 |
| 1984 | 6.223 |
| 1983 | 6.54805 |
| 1982 | 6.06435 |
| 1981 | 9.41179 |
| 1980 | 12.2797 |
| 1979 | 11.601 |
| 1978 | 5.55801 |
| 1977 | 4.32661 |
| 1976 | 4.11075 |
| 1975 | 3.13064 |
| 1974 | 2.77486 |
| 1973 | 0.335981 |
| 1972 | 0.110289 |
| 1971 | 0.0326166 |
| 1970 | 0.0239933 |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |