| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 19.8785 |
| 2021 | 19.0074 |
| 2020 | 18.1592 |
| 2019 | 17.2443 |
| 2018 | 16.3698 |
| 2017 | 15.494 |
| 2016 | 14.6874 |
| 2015 | 13.9899 |
| 2014 | 13.3783 |
| 2013 | 12.8819 |
| 2012 | 12.457 |
| 2011 | 12.1023 |
| 2010 | 11.815 |
| 2009 | 11.5857 |
| 2008 | 11.3944 |
| 2007 | 11.2197 |
| 2006 | 11.0362 |
| 2005 | 10.8798 |
| 2004 | 10.7685 |
| 2003 | 10.6416 |
| 2002 | 10.4845 |
| 2001 | 10.3061 |
| 2000 | 10.0964 |
| 1999 | 9.86824 |
| 1998 | 9.61491 |
| 1997 | 9.38309 |
| 1996 | 9.19801 |
| 1995 | 8.99594 |
| 1994 | 8.78393 |
| 1993 | 8.5708 |
| 1992 | 8.35948 |
| 1991 | 8.19611 |
| 1990 | 8.04611 |
| 1989 | 7.88237 |
| 1988 | 7.75122 |
| 1987 | 7.66463 |
| 1986 | 7.59752 |
| 1985 | 7.54072 |
| 1984 | 7.50103 |
| 1983 | 7.48847 |
| 1982 | 7.46352 |
| 1981 | 7.41647 |
| 1980 | 7.37924 |
| 1979 | 7.33319 |
| 1978 | 7.30396 |
| 1977 | 7.29494 |
| 1976 | 7.22466 |
| 1975 | 7.09805 |
| 1974 | 6.95605 |
| 1973 | 6.83483 |
| 1972 | 6.78044 |
| 1971 | 6.74519 |
| 1970 | 6.70199 |
| 1969 | 6.67295 |
| 1968 | 6.63915 |
| 1967 | 6.62119 |
| 1966 | 6.62196 |
| 1965 | 6.63744 |
| 1964 | 6.69165 |
| 1963 | 6.75692 |
| 1962 | 6.81192 |
| 1961 | 6.91832 |
| 1960 | 7.12415 |