| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 5.0418 |
| 2021 | 5.1343 |
| 2020 | 5.46988 |
| 2019 | 5.80928 |
| 2018 | 6.00607 |
| 2017 | 6.01981 |
| 2016 | 5.95707 |
| 2015 | 5.83038 |
| 2014 | 5.60433 |
| 2013 | 5.31982 |
| 2012 | 4.96849 |
| 2011 | 4.60726 |
| 2010 | 4.27734 |
| 2009 | 3.971 |
| 2008 | 3.72844 |
| 2007 | 3.53464 |
| 2006 | 3.40132 |
| 2005 | 3.3108 |
| 2004 | 3.24361 |
| 2003 | 3.20224 |
| 2002 | 3.18538 |
| 2001 | 3.17086 |
| 2000 | 3.1722 |
| 1999 | 3.20083 |
| 1998 | 3.23257 |
| 1997 | 3.23563 |
| 1996 | 3.19993 |
| 1995 | 3.14529 |
| 1994 | 3.08541 |
| 1993 | 3.02126 |
| 1992 | 2.96613 |
| 1991 | 2.92274 |
| 1990 | 2.89321 |
| 1989 | 2.88422 |
| 1988 | 2.86861 |
| 1987 | 2.84052 |
| 1986 | 2.83067 |
| 1985 | 2.81702 |
| 1984 | 2.77336 |
| 1983 | 2.72178 |
| 1982 | 2.69349 |
| 1981 | 2.68024 |
| 1980 | 2.66136 |
| 1979 | 2.65237 |
| 1978 | 2.65797 |
| 1977 | 2.64294 |
| 1976 | 2.60256 |
| 1975 | 2.56653 |
| 1974 | 2.5457 |
| 1973 | 2.53869 |
| 1972 | 2.55289 |
| 1971 | 2.59494 |
| 1970 | 2.64917 |
| 1969 | 2.68811 |
| 1968 | 2.72259 |
| 1967 | 2.7613 |
| 1966 | 2.78598 |
| 1965 | 2.79032 |
| 1964 | 2.76991 |
| 1963 | 2.74172 |
| 1962 | 2.71933 |
| 1961 | 2.68555 |
| 1960 | 2.66734 |