| 强度指数 | 强年(>1) | 1951 | 1953 | 1955 | 1957 | 1964 | 1967 | 1977 |
| 1984 | 2006 | 2012 |
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| 弱年(<–1) | 1949 | 1971 | 1972 | 1973 | 1979 | 1992 | 1997 | |
| 2007 |
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| 面积指数 | 强年(>1) | 1951 | 1953 | 1955 | 1956 | 1957 | 1965 | 1977 |
| 2000 | 2005 | 2006 | 2012 |
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| 弱年(<–1) | 1949 | 1972 | 1973 | 1979 | 1989 | 1992 | 1993 | |
| 1997 | 2002 | 2004 | 2007 | 2017 |
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