| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 7.76151 |
| 2021 | 7.35931 |
| 2020 | 6.65623 |
| 2019 | 5.97688 |
| 2018 | 5.32949 |
| 2017 | 4.95718 |
| 2016 | 5.07197 |
| 2015 | 5.42171 |
| 2014 | 5.7675 |
| 2013 | 5.96509 |
| 2012 | 5.97236 |
| 2011 | 5.89979 |
| 2010 | 5.76783 |
| 2009 | 5.5503 |
| 2008 | 5.29485 |
| 2007 | 4.99333 |
| 2006 | 4.6893 |
| 2005 | 4.41013 |
| 2004 | 4.14641 |
| 2003 | 3.93371 |
| 2002 | 3.75153 |
| 2001 | 3.62797 |
| 2000 | 3.56329 |
| 1999 | 3.52267 |
| 1998 | 3.50804 |
| 1997 | 3.5232 |
| 1996 | 3.5308 |
| 1995 | 3.53493 |
| 1994 | 3.55895 |
| 1993 | 3.58648 |
| 1992 | 3.58012 |
| 1991 | 3.54098 |
| 1990 | 3.50639 |
| 1989 | 3.47258 |
| 1988 | 3.41828 |
| 1987 | 3.37191 |
| 1986 | 3.33521 |
| 1985 | 3.294 |
| 1984 | 3.2645 |
| 1983 | 3.22689 |
| 1982 | 3.17511 |
| 1981 | 3.14527 |
| 1980 | 3.11357 |
| 1979 | 3.05206 |
| 1978 | 2.98369 |
| 1977 | 2.93709 |
| 1976 | 2.90587 |
| 1975 | 2.87987 |
| 1974 | 2.88325 |
| 1973 | 2.91972 |
| 1972 | 2.94209 |
| 1971 | 2.93922 |
| 1970 | 2.93628 |
| 1969 | 2.93209 |
| 1968 | 2.92631 |
| 1967 | 2.93347 |
| 1966 | 2.9653 |
| 1965 | 3.01336 |
| 1964 | 3.05562 |
| 1963 | 3.11466 |
| 1962 | 3.18532 |
| 1961 | 3.2138 |
| 1960 | 3.20583 |