| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 13.7223 |
| 2021 | 13.1498 |
| 2020 | 12.5983 |
| 2019 | 12.0221 |
| 2018 | 11.4801 |
| 2017 | 10.9464 |
| 2016 | 10.4568 |
| 2015 | 10.0201 |
| 2014 | 9.63319 |
| 2013 | 9.32038 |
| 2012 | 9.0493 |
| 2011 | 8.81615 |
| 2010 | 8.61655 |
| 2009 | 8.45028 |
| 2008 | 8.30353 |
| 2007 | 8.15896 |
| 2006 | 7.9968 |
| 2005 | 7.82542 |
| 2004 | 7.66635 |
| 2003 | 7.50239 |
| 2002 | 7.31743 |
| 2001 | 7.12108 |
| 2000 | 6.92063 |
| 1999 | 6.72079 |
| 1998 | 6.51267 |
| 1997 | 6.31516 |
| 1996 | 6.14679 |
| 1995 | 5.98053 |
| 1994 | 5.81679 |
| 1993 | 5.66122 |
| 1992 | 5.51405 |
| 1991 | 5.39705 |
| 1990 | 5.29592 |
| 1989 | 5.18555 |
| 1988 | 5.07802 |
| 1987 | 4.99046 |
| 1986 | 4.90818 |
| 1985 | 4.81593 |
| 1984 | 4.72333 |
| 1983 | 4.64037 |
| 1982 | 4.5626 |
| 1981 | 4.48056 |
| 1980 | 4.38954 |
| 1979 | 4.28698 |
| 1978 | 4.1792 |
| 1977 | 4.08829 |
| 1976 | 4.01899 |
| 1975 | 3.95421 |
| 1974 | 3.88467 |
| 1973 | 3.82194 |
| 1972 | 3.7778 |
| 1971 | 3.74342 |
| 1970 | 3.71252 |
| 1969 | 3.68749 |
| 1968 | 3.66466 |
| 1967 | 3.64236 |
| 1966 | 3.63026 |
| 1965 | 3.64231 |
| 1964 | 3.68532 |
| 1963 | 3.75632 |
| 1962 | 3.82578 |
| 1961 | 3.88327 |
| 1960 | 3.9673 |