訪問完整數據圖表請先購買:
| 年份 | 單位：‰ |
| 含“(e)”其對應值為系統預測，僅供參考。 | |
| 2028（e） | |
| 2027（e） | |
| 2026（e） | |
| 2025 | |
| 2024 | |
| 2023 | |
| 2022 | |
| 2021 | |
| 2020 | |
| 2019 | |
| 2018 | |
| 2017 | |
| 2016 | |
| 2015 | 7.11 |
| 2014 | 7.16 |
| 2013 | 7.16 |
| 2012 | 7.15 |
| 2011 | 7.14 |
| 2010 | 7.11 |
| 2009 | 7.08 |
| 2008 | 7.06 |
| 2007 | 6.93 |
| 2006 | 6.81 |
| 2005 | 6.51 |
| 2004 | 6.42 |
| 2003 | 6.40 |
| 2002 | 6.41 |
| 2001 | 6.43 |
| 2000 | 6.45 |
| 1999 | 6.46 |
| 1998 | 6.50 |
| 1997 | 6.51 |
| 1996 | 6.56 |
| 1995 | 6.57 |
| 1994 | 6.49 |
| 1993 | 6.64 |
| 1992 | 6.64 |
| 1991 | 6.70 |
| 1990 | 6.67 |
| 1989 | 6.54 |
| 1988 | 6.64 |
| 1987 | 6.72 |
| 1986 | 6.86 |
| 1985 | 6.78 |
| 1984 | 6.82 |
| 1983 | 6.90 |
| 1982 | 6.60 |
| 1981 | 6.36 |
| 1980 | 6.34 |
| 1979 | 6.21 |
| 1978 | 6.25 |
| 1977 | 6.87 |
| 1976 | 7.25 |
| 1975 | 7.32 |
| 1974 | 7.34 |
| 1973 | 7.04 |
| 1972 | 7.61 |
| 1971 | 7.32 |
| 1970 | 7.60 |
| 1969 | 8.63 |
| 1968 | 8.21 |
| 1967 | 8.43 |
| 1966 | 8.83 |
| 1965 | 9.50 |
| 1964 | 11.50 |
| 1963 | 10.04 |
| 1962 | 10.02 |
| 1961 | 14.24 |
| 1960 | 25.43 |
| 1959 | 14.59 |
| 1958 | 11.98 |
| 1957 | 10.80 |
| 1956 | 11.40 |
| 1955 | 12.28 |
| 1954 | 13.18 |
| 1953 | 14.00 |
| 1952 | 17.00 |
| 1951 | 17.80 |
| 1950 | 18.00 |
| 1949 | 20.00 |
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