| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 2.02381 |
| 2020 | 2.01316 |
| 2019 | 1.99186 |
| 2018 | 1.9173 |
| 2017 | 1.84629 |
| 2016 | 1.77528 |
| 2015 | 1.70427 |
| 2014 | 1.7064 |
| 2013 | 1.70427 |
| 2012 | 1.68296 |
| 2011 | 1.61905 |
| 2010 | 1.54449 |
| 2009 | 1.49123 |
| 2008 | 1.44863 |
| 2007 | 1.41134 |
| 2006 | 1.34211 |
| 2005 | 1.31548 |
| 2004 | 1.2782 |
| 2003 | 1.23559 |
| 2002 | 1.19299 |
| 2001 | 1.17168 |
| 2000 | 1.17168 |
| 1999 | 1.17168 |
| 1998 | 1.17168 |
| 1997 | 1.17168 |
| 1996 | 1.13972 |
| 1995 | 1.1099 |
| 1994 | 0.9906 |
| 1993 | 0.92669 |
| 1992 | 0.830826 |
| 1991 | 0.798871 |
| 1990 | 0.798871 |
| 1989 | 0.798871 |
| 1988 | 0.777568 |
| 1987 | 0.745613 |
| 1986 | 0.639097 |
| 1985 | 0.521929 |
| 1984 | 0.404761 |
| 1983 | 0.372806 |
| 1982 | 0.351503 |
| 1981 | 0.341917 |
| 1980 | 0.333395 |
| 1979 | 0.324661 |
| 1978 | 0.315288 |
| 1977 | 0.306766 |
| 1976 | 0.298245 |
| 1975 | 0.289724 |
| 1974 | 0.281203 |
| 1973 | 0.272681 |
| 1972 | 0.26416 |
| 1971 | 0.255639 |
| 1970 | 0.247117 |
| 1969 | 0.238596 |
| 1968 | 0.230075 |
| 1967 | 0.221554 |
| 1966 | 0.213032 |
| 1965 | 0.207706 |
| 1964 | 0.202381 |
| 1963 | 0.197055 |
| 1962 | 0.191729 |
| 1961 | 0.186403 |
| 1960 | - |