| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 7.18 |
| 2020 | 7.07 |
| 2019 | 7.09 |
| 2018 | 7.08 |
| 2017 | 7.06 |
| 2016 | 7.04 |
| 2015 | 7.07 |
| 2014 | 7.12 |
| 2013 | 7.13 |
| 2012 | 7.13 |
| 2011 | 7.14 |
| 2010 | 7.11 |
| 2009 | 7.08 |
| 2008 | 7.06 |
| 2007 | 6.93 |
| 2006 | 6.81 |
| 2005 | 6.51 |
| 2004 | 6.42 |
| 2003 | 6.4 |
| 2002 | 6.41 |
| 2001 | 6.43 |
| 2000 | 6.45 |
| 1999 | 6.46 |
| 1998 | 6.5 |
| 1997 | 6.51 |
| 1996 | 6.56 |
| 1995 | 6.57 |
| 1994 | 6.49 |
| 1993 | 6.64 |
| 1992 | 6.64 |
| 1991 | 6.7 |
| 1990 | 6.67 |
| 1989 | 6.54 |
| 1988 | 6.64 |
| 1987 | 6.72 |
| 1986 | 6.86 |
| 1985 | 6.78 |
| 1984 | 6.82 |
| 1983 | 6.9 |
| 1982 | 6.6 |
| 1981 | 6.36 |
| 1980 | 6.34 |
| 1979 | 6.21 |
| 1978 | 6.25 |
| 1977 | 6.87 |
| 1976 | 7.25 |
| 1975 | 7.32 |
| 1974 | 7.34 |
| 1973 | 7.04 |
| 1972 | 7.61 |
| 1971 | 7.32 |
| 1970 | 7.6 |
| 1969 | 8.03 |
| 1968 | 8.21 |
| 1967 | 8.43 |
| 1966 | 8.83 |
| 1965 | 9.5 |
| 1964 | 11.5 |
| 1963 | 10.04 |
| 1962 | 10.02 |
| 1961 | 14.24 |
| 1960 | 25.43 |