| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.210525 |
| 2020 | 0.13554 |
| 2019 | 0.160723 |
| 2018 | 0.153295 |
| 2017 | 0.106613 |
| 2016 | 0.104844 |
| 2015 | 0.134796 |
| 2014 | 0.125699 |
| 2013 | 0.0941455 |
| 2012 | 0.101497 |
| 2011 | 0.111272 |
| 2010 | 0.114499 |
| 2009 | 0.113037 |
| 2008 | 0.117611 |
| 2007 | 0.12554 |
| 2006 | 0.142535 |
| 2005 | 0.164824 |
| 2004 | 0.156262 |
| 2003 | 0.134316 |
| 2002 | 0.11445 |
| 2001 | 0.134244 |
| 2000 | 0.146509 |
| 1999 | 0.0962945 |
| 1998 | 0.0857853 |
| 1997 | 0.123888 |
| 1996 | 0.11848 |
| 1995 | 0.100749 |
| 1994 | 0.123498 |
| 1993 | 0.1311 |
| 1992 | 0.110444 |
| 1991 | 0.112413 |
| 1990 | 0.137794 |
| 1989 | 0.105879 |
| 1988 | 0.102788 |
| 1987 | 0.1413 |
| 1986 | 0.143335 |
| 1985 | 0.0848619 |
| 1984 | 0.0757827 |
| 1983 | 0.065267 |
| 1982 | 0.0321591 |
| 1981 | 0.11788 |
| 1980 | 0.32273 |
| 1979 | 0.372525 |
| 1978 | 0.298356 |
| 1977 | 0.197543 |
| 1976 | 0.199514 |
| 1975 | 0.156379 |
| 1974 | 0.0854365 |
| 1973 | 0.0146021 |
| 1972 | 0.00920335 |
| 1971 | 0.00543129 |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |