| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 4.90274 |
| 2021 | 5.45391 |
| 2020 | 5.91906 |
| 2019 | 6.27482 |
| 2018 | 6.5522 |
| 2017 | 6.72067 |
| 2016 | 6.7793 |
| 2015 | 6.82494 |
| 2014 | 6.86499 |
| 2013 | 6.86998 |
| 2012 | 6.82449 |
| 2011 | 6.7595 |
| 2010 | 6.7146 |
| 2009 | 6.64061 |
| 2008 | 6.5521 |
| 2007 | 6.48371 |
| 2006 | 6.45475 |
| 2005 | 6.48924 |
| 2004 | 6.54825 |
| 2003 | 6.6079 |
| 2002 | 6.70553 |
| 2001 | 6.83799 |
| 2000 | 6.98394 |
| 1999 | 7.17496 |
| 1998 | 7.43547 |
| 1997 | 7.73517 |
| 1996 | 8.10042 |
| 1995 | 8.70647 |
| 1994 | 9.45483 |
| 1993 | 10.0955 |
| 1992 | 10.7052 |
| 1991 | 11.2224 |
| 1990 | 11.3393 |
| 1989 | 11.1536 |
| 1988 | 10.9332 |
| 1987 | 10.7608 |
| 1986 | 10.636 |
| 1985 | 10.5264 |
| 1984 | 10.4721 |
| 1983 | 10.436 |
| 1982 | 10.2796 |
| 1981 | 10.1524 |
| 1980 | 10.2693 |
| 1979 | 10.6377 |
| 1978 | 11.3162 |
| 1977 | 12.1972 |
| 1976 | 13.1268 |
| 1975 | 14.1055 |
| 1974 | 15.0012 |
| 1973 | 15.7202 |
| 1972 | 16.1635 |
| 1971 | 16.4071 |
| 1970 | 16.6618 |
| 1969 | 16.914 |
| 1968 | 17.3468 |
| 1967 | 17.7808 |
| 1966 | 17.367 |
| 1965 | 16.2202 |
| 1964 | 15.0459 |
| 1963 | 13.8716 |
| 1962 | 13.2587 |
| 1961 | 13.8262 |
| 1960 | 15.0948 |