| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 7.29818 |
| 2021 | 7.71496 |
| 2020 | 8.13369 |
| 2019 | 8.4802 |
| 2018 | 8.69826 |
| 2017 | 8.74801 |
| 2016 | 8.68026 |
| 2015 | 8.60104 |
| 2014 | 8.51726 |
| 2013 | 8.52948 |
| 2012 | 8.55542 |
| 2011 | 8.17396 |
| 2010 | 7.44082 |
| 2009 | 6.71889 |
| 2008 | 6.02279 |
| 2007 | 5.62661 |
| 2006 | 5.76872 |
| 2005 | 6.17374 |
| 2004 | 6.5721 |
| 2003 | 6.79851 |
| 2002 | 6.80781 |
| 2001 | 6.72692 |
| 2000 | 6.58272 |
| 1999 | 6.34156 |
| 1998 | 6.05683 |
| 1997 | 5.723 |
| 1996 | 5.38917 |
| 1995 | 5.08636 |
| 1994 | 4.80278 |
| 1993 | 4.57879 |
| 1992 | 4.39306 |
| 1991 | 4.28035 |
| 1990 | 4.24798 |
| 1989 | 4.25192 |
| 1988 | 4.28536 |
| 1987 | 4.35661 |
| 1986 | 4.41866 |
| 1985 | 4.46905 |
| 1984 | 4.53652 |
| 1983 | 4.60225 |
| 1982 | 4.62626 |
| 1981 | 4.60491 |
| 1980 | 4.56885 |
| 1979 | 4.52116 |
| 1978 | 4.44657 |
| 1977 | 4.37829 |
| 1976 | 4.32516 |
| 1975 | 4.27912 |
| 1974 | 4.2638 |
| 1973 | 4.25333 |
| 1972 | 4.22801 |
| 1971 | 4.23566 |
| 1970 | 4.25621 |
| 1969 | 4.24518 |
| 1968 | 4.22986 |
| 1967 | 4.2405 |
| 1966 | 4.26597 |
| 1965 | 4.30351 |
| 1964 | 4.38252 |
| 1963 | 4.51526 |
| 1962 | 4.61396 |
| 1961 | 4.61131 |
| 1960 | 4.5649 |