| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 6.79809 |
| 2021 | 6.58358 |
| 2020 | 6.54074 |
| 2019 | 6.67025 |
| 2018 | 7.00206 |
| 2017 | 7.46133 |
| 2016 | 7.93954 |
| 2015 | 8.42062 |
| 2014 | 8.82107 |
| 2013 | 9.08331 |
| 2012 | 9.16083 |
| 2011 | 9.10437 |
| 2010 | 9.03376 |
| 2009 | 8.95703 |
| 2008 | 8.97711 |
| 2007 | 9.00541 |
| 2006 | 8.60179 |
| 2005 | 7.83035 |
| 2004 | 7.06956 |
| 2003 | 6.33691 |
| 2002 | 5.92209 |
| 2001 | 6.07409 |
| 2000 | 6.50562 |
| 1999 | 6.93247 |
| 1998 | 7.17893 |
| 1997 | 7.19992 |
| 1996 | 7.12771 |
| 1995 | 6.98863 |
| 1994 | 6.74945 |
| 1993 | 6.46744 |
| 1992 | 6.13369 |
| 1991 | 5.80139 |
| 1990 | 5.51382 |
| 1989 | 5.25124 |
| 1988 | 5.04358 |
| 1987 | 4.87394 |
| 1986 | 4.77909 |
| 1985 | 4.75197 |
| 1984 | 4.74924 |
| 1983 | 4.77763 |
| 1982 | 4.85047 |
| 1981 | 4.91543 |
| 1980 | 4.96808 |
| 1979 | 5.0424 |
| 1978 | 5.11554 |
| 1977 | 5.13503 |
| 1976 | 5.10525 |
| 1975 | 5.07264 |
| 1974 | 5.04072 |
| 1973 | 4.99559 |
| 1972 | 4.96796 |
| 1971 | 4.95914 |
| 1970 | 4.96121 |
| 1969 | 4.99487 |
| 1968 | 5.02492 |
| 1967 | 5.02148 |
| 1966 | 5.04512 |
| 1965 | 5.08544 |
| 1964 | 5.08843 |
| 1963 | 5.09859 |
| 1962 | 5.14214 |
| 1961 | 5.14475 |
| 1960 | 5.10604 |