| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 1.70756 |
| 2020 | 0.863775 |
| 2019 | 1.26691 |
| 2018 | 1.42518 |
| 2017 | 1.31424 |
| 2016 | 1.05247 |
| 2015 | 1.17477 |
| 2014 | 2.31013 |
| 2013 | 2.98307 |
| 2012 | 4.08849 |
| 2011 | 7.6852 |
| 2010 | 6.28673 |
| 2009 | 3.91782 |
| 2008 | 9.64841 |
| 2007 | 6.32788 |
| 2006 | 5.5212 |
| 2005 | 5.10277 |
| 2004 | 4.72488 |
| 2003 | 2.01791 |
| 2002 | 1.9563 |
| 2001 | 2.59238 |
| 2000 | 2.69774 |
| 1999 | 1.84533 |
| 1998 | 1.71539 |
| 1997 | 2.39156 |
| 1996 | 3.0048 |
| 1995 | 3.267 |
| 1994 | 3.28088 |
| 1993 | 4.44907 |
| 1992 | 5.33847 |
| 1991 | 6.08172 |
| 1990 | 8.6387 |
| 1989 | 7.05998 |
| 1988 | 6.28565 |
| 1987 | 6.49281 |
| 1986 | 5.75921 |
| 1985 | 9.78978 |
| 1984 | 10.3999 |
| 1983 | 12.6162 |
| 1982 | 16.7509 |
| 1981 | 19.4674 |
| 1980 | 19.7416 |
| 1979 | 17.0999 |
| 1978 | 11.2105 |
| 1977 | 9.60235 |
| 1976 | 9.22371 |
| 1975 | 7.33042 |
| 1974 | 5.00071 |
| 1973 | 1.79558 |
| 1972 | 0.895123 |
| 1971 | 0.773897 |
| 1970 | 0.840417 |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |