| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 4.53492 |
| 2021 | 5.02727 |
| 2020 | 5.43938 |
| 2019 | 5.7474 |
| 2018 | 5.98061 |
| 2017 | 6.11318 |
| 2016 | 6.14519 |
| 2015 | 6.16675 |
| 2014 | 6.18493 |
| 2013 | 6.1734 |
| 2012 | 6.11926 |
| 2011 | 6.05029 |
| 2010 | 6.00229 |
| 2009 | 5.9307 |
| 2008 | 5.84851 |
| 2007 | 5.78681 |
| 2006 | 5.76295 |
| 2005 | 5.79858 |
| 2004 | 5.85885 |
| 2003 | 5.9222 |
| 2002 | 6.02239 |
| 2001 | 6.15714 |
| 2000 | 6.30687 |
| 1999 | 6.50032 |
| 1998 | 6.76205 |
| 1997 | 7.06551 |
| 1996 | 7.43488 |
| 1995 | 8.03568 |
| 1994 | 8.77572 |
| 1993 | 9.42015 |
| 1992 | 10.0407 |
| 1991 | 10.577 |
| 1990 | 10.7376 |
| 1989 | 10.612 |
| 1988 | 10.4489 |
| 1987 | 10.3277 |
| 1986 | 10.2468 |
| 1985 | 10.1728 |
| 1984 | 10.1453 |
| 1983 | 10.1306 |
| 1982 | 9.99566 |
| 1981 | 9.88685 |
| 1980 | 10.0147 |
| 1979 | 10.3878 |
| 1978 | 11.0642 |
| 1977 | 11.9379 |
| 1976 | 12.8591 |
| 1975 | 13.8299 |
| 1974 | 14.721 |
| 1973 | 15.4399 |
| 1972 | 15.8863 |
| 1971 | 16.1346 |
| 1970 | 16.3947 |
| 1969 | 16.6544 |
| 1968 | 17.0934 |
| 1967 | 17.5352 |
| 1966 | 17.1407 |
| 1965 | 16.0205 |
| 1964 | 14.8672 |
| 1963 | 13.7085 |
| 1962 | 13.1061 |
| 1961 | 13.6873 |
| 1960 | 14.9925 |