| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 1.164 |
| 2020 | 1.281 |
| 2019 | 1.496 |
| 2018 | 1.554 |
| 2017 | 1.813 |
| 2016 | 1.772 |
| 2015 | 1.67 |
| 2014 | 1.769 |
| 2013 | 1.714 |
| 2012 | 1.798 |
| 2011 | 1.668 |
| 2010 | 1.687 |
| 2009 | 1.714 |
| 2008 | 1.701 |
| 2007 | 1.666 |
| 2006 | 1.644 |
| 2005 | 1.624 |
| 2004 | 1.605 |
| 2003 | 1.57 |
| 2002 | 1.566 |
| 2001 | 1.563 |
| 2000 | 1.628 |
| 1999 | 1.53 |
| 1998 | 1.522 |
| 1997 | 1.527 |
| 1996 | 1.554 |
| 1995 | 1.588 |
| 1994 | 1.628 |
| 1993 | 1.691 |
| 1992 | 1.776 |
| 1991 | 1.934 |
| 1990 | 2.514 |
| 1989 | 2.52 |
| 1988 | 2.539 |
| 1987 | 2.76 |
| 1986 | 2.721 |
| 1985 | 2.633 |
| 1984 | 2.607 |
| 1983 | 2.559 |
| 1982 | 2.972 |
| 1981 | 2.792 |
| 1980 | 2.739 |
| 1979 | 2.745 |
| 1978 | 2.716 |
| 1977 | 2.844 |
| 1976 | 3.235 |
| 1975 | 3.571 |
| 1974 | 4.17 |
| 1973 | 4.726 |
| 1972 | 5.112 |
| 1971 | 5.523 |
| 1970 | 6.085 |
| 1969 | 6.175 |
| 1968 | 6.508 |
| 1967 | 5.806 |
| 1966 | 6.307 |
| 1965 | 6.605 |
| 1964 | 6.672 |
| 1963 | 7.513 |
| 1962 | 6.085 |
| 1961 | 3.863 |
| 1960 | 4.451 |