| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 1.64948 |
| 2021 | 1.83853 |
| 2020 | 2.07814 |
| 2019 | 2.29018 |
| 2018 | 2.5034 |
| 2017 | 2.73966 |
| 2016 | 2.77564 |
| 2015 | 2.84287 |
| 2014 | 2.9535 |
| 2013 | 3.04837 |
| 2012 | 3.13066 |
| 2011 | 3.12338 |
| 2010 | 3.25537 |
| 2009 | 3.3381 |
| 2008 | 3.43396 |
| 2007 | 3.51126 |
| 2006 | 3.67473 |
| 2005 | 3.88247 |
| 2004 | 3.97537 |
| 2003 | 4.0784 |
| 2002 | 4.198 |
| 2001 | 4.05957 |
| 2000 | 3.64925 |
| 1999 | 3.77009 |
| 1998 | 3.90808 |
| 1997 | 4.00829 |
| 1996 | 4.08605 |
| 1995 | 4.15964 |
| 1994 | 4.24584 |
| 1993 | 4.30155 |
| 1992 | 4.42512 |
| 1991 | 4.60169 |
| 1990 | 4.30968 |
| 1989 | 4.40263 |
| 1988 | 4.51483 |
| 1987 | 4.53158 |
| 1986 | 4.4381 |
| 1985 | 4.33905 |
| 1984 | 4.32043 |
| 1983 | 4.47484 |
| 1982 | 5.29567 |
| 1981 | 5.13187 |
| 1980 | 5.15728 |
| 1979 | 5.26137 |
| 1978 | 3.48395 |
| 1977 | 1.70583 |
| 1976 | 1.89157 |
| 1975 | 2.38902 |
| 1974 | 2.69248 |
| 1973 | 2.2834 |
| 1972 | 1.83083 |
| 1971 | 2.12429 |
| 1970 | 2.02874 |
| 1969 | 2.0124 |
| 1968 | 1.88293 |
| 1967 | 1.8424 |
| 1966 | 1.83735 |
| 1965 | 1.21054 |
| 1964 | 5.32734 |
| 1963 | 5.49364 |
| 1962 | 3.87368 |
| 1961 | 2.0536 |
| 1960 | - |