| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 20.677 |
| 2021 | 19.944 |
| 2020 | 18.5861 |
| 2019 | 18.41 |
| 2018 | 19.1121 |
| 2017 | 19.6923 |
| 2016 | 19.5844 |
| 2015 | 21.3541 |
| 2014 | 23.5101 |
| 2013 | 24.5993 |
| 2012 | 25.4925 |
| 2011 | 26.5682 |
| 2010 | 27.1853 |
| 2009 | 24.7499 |
| 2008 | 32.6027 |
| 2007 | 35.4348 |
| 2006 | 36.035 |
| 2005 | 33.8299 |
| 2004 | 31.0613 |
| 2003 | 26.9808 |
| 2002 | 22.6447 |
| 2001 | 20.3121 |
| 2000 | 20.8937 |
| 1999 | 18.1625 |
| 1998 | 18.3421 |
| 1997 | 19.4932 |
| 1996 | 17.9233 |
| 1995 | 17.9525 |
| 1994 | 18.5367 |
| 1993 | 11.9979 |
| 1992 | 13.5555 |
| 1991 | 13.4364 |
| 1990 | 12.4516 |
| 1989 | 9.02734 |
| 1988 | 11.0149 |
| 1987 | 10.417 |
| 1986 | 8.71925 |
| 1985 | 8.32744 |
| 1984 | 7.89355 |
| 1983 | 7.20472 |
| 1982 | 7.95979 |
| 1981 | 7.44758 |
| 1980 | 5.91161 |
| 1979 | 5.16284 |
| 1978 | 4.55595 |
| 1977 | 4.29846 |
| 1976 | 4.51047 |
| 1975 | 4.70472 |
| 1974 | 4.9298 |
| 1973 | 4.24135 |
| 1972 | 3.24792 |
| 1971 | 2.78807 |
| 1970 | 2.49156 |
| 1969 | 3.0476 |
| 1968 | 3.30256 |
| 1967 | 3.27723 |
| 1966 | 3.49447 |
| 1965 | 3.63898 |
| 1964 | 3.76896 |
| 1963 | 4.00545 |
| 1962 | 4.05266 |
| 1961 | 3.87081 |
| 1960 | 4.30583 |