| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 6.74036 |
| 2021 | 6.54768 |
| 2020 | 6.52504 |
| 2019 | 6.67307 |
| 2018 | 7.02293 |
| 2017 | 7.50024 |
| 2016 | 7.99608 |
| 2015 | 8.4955 |
| 2014 | 8.91462 |
| 2013 | 9.195 |
| 2012 | 9.28751 |
| 2011 | 9.24255 |
| 2010 | 9.18138 |
| 2009 | 9.11032 |
| 2008 | 9.13472 |
| 2007 | 9.16533 |
| 2006 | 8.75387 |
| 2005 | 7.96765 |
| 2004 | 7.19175 |
| 2003 | 6.44401 |
| 2002 | 6.02142 |
| 2001 | 6.17703 |
| 2000 | 6.61902 |
| 1999 | 7.06066 |
| 1998 | 7.32412 |
| 1997 | 7.361 |
| 1996 | 7.29962 |
| 1995 | 7.16499 |
| 1994 | 6.91369 |
| 1993 | 6.59479 |
| 1992 | 6.19684 |
| 1991 | 5.79028 |
| 1990 | 5.43714 |
| 1989 | 5.11594 |
| 1988 | 4.86343 |
| 1987 | 4.67176 |
| 1986 | 4.55949 |
| 1985 | 4.49824 |
| 1984 | 4.46231 |
| 1983 | 4.45826 |
| 1982 | 4.49402 |
| 1981 | 4.53767 |
| 1980 | 4.59817 |
| 1979 | 4.69414 |
| 1978 | 4.79268 |
| 1977 | 4.8459 |
| 1976 | 4.84224 |
| 1975 | 4.81487 |
| 1974 | 4.78605 |
| 1973 | 4.7595 |
| 1972 | 4.75101 |
| 1971 | 4.75911 |
| 1970 | 4.78528 |
| 1969 | 4.84494 |
| 1968 | 4.90097 |
| 1967 | 4.92659 |
| 1966 | 4.97834 |
| 1965 | 5.04341 |
| 1964 | 5.06942 |
| 1963 | 5.10035 |
| 1962 | 5.16472 |
| 1961 | 5.18986 |
| 1960 | 5.16155 |