| 年份 | 单位：‰ |
| 含“(E)”其对应值为系统预测，仅供参考。 | |
| 2027（E） | 购买后可见 » |
| 2026（E） | 购买后可见 » |
| 2025（E） | 购买后可见 » |
| 2024 | 购买后可见 » |
| 2023 | 购买后可见 » |
| 2022 | 购买后可见 » |
| 2021 | 购买后可见 » |
| 2020 | 购买后可见 » |
| 2019 | 购买后可见 » |
| 2018 | 购买后可见 » |
| 2017 | 购买后可见 » |
| 2016 | 购买后可见 » |
| 2015 | 购买后可见 » |
| 2014 | 9.00 |
| 2013 | 7.60 |
| 2012 | 8.10 |
| 2011 | 7.40 |
| 2010 | 8.80 |
| 2009 | 7.60 |
| 2008 | 7.90 |
| 2007 | 8.20 |
| 2006 | 7.80 |
| 2005 | 7.80 |
| 2004 | 7.70 |
| 2003 | 6.20 |
| 2002 | 7.50 |
| 2001 | 7.10 |
| 2000 | 10.70 |
| 1999 | 8.00 |
| 1998 | 7.90 |
| 1997 | 8.90 |
| 1996 | 9.50 |
| 1995 | 9.90 |
| 1994 | 10.70 |
| 1993 | 10.00 |
| 1992 | 10.20 |
| 1991 | 9.90 |
| 1990 | 14.50 |
| 1989 | 14.60 |
| 1988 | 15.40 |
| 1987 | 17.30 |
| 1986 | 14.80 |
| 1985 | 11.90 |
| 1984 | 10.80 |
| 1983 | 13.40 |
| 1982 | 18.90 |
| 1981 | 16.60 |
| 1980 | 14.10 |
| 1978 | 18.00 |
| 1975 | 15.90 |
| 1970 | 26.60 |
| 1965 | 36.20 |
| 1962 | 34.10 |
| 1957 | 41.90 |
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