| Year | Max mag. | Total hits |
|---|---|---|
| 1933 | 7.1 | 1 |
| 2015 | 7.1 | 55 |
| 1912 | 7 | 1 |
| 1910 | 6.9 | 1 |
| 1974 | 6.9 | 43 |
| 1967 | 6.8 | 1 |
| 1951 | 6.8 | 2 |
| 1960 | 6.8 | 1 |
| 1963 | 6.8 | 2 |
| 2012 | 6.8 | 59 |
| 1998 | 6.7 | 64 |
| 1975 | 6.5 | 38 |
| 2000 | 6.5 | 78 |
| 2008 | 6.3 | 55 |
| 1971 | 6.3 | 1 |
| 1976 | 6.2 | 59 |
| 2011 | 6.2 | 71 |
| 2009 | 6.1 | 53 |
| 1968 | 6 | 1 |
| 1969 | 6 | 1 |
| 1972 | 5.9 | 3 |
| 2004 | 5.9 | 78 |
| 2017 | 5.9 | 49 |
| 2002 | 5.8 | 52 |
| 1965 | 5.8 | 1 |
| 1987 | 5.8 | 30 |
| 1988 | 5.8 | 39 |
| 1989 | 5.7 | 76 |
| 1999 | 5.7 | 68 |
| 2005 | 5.7 | 193 |
| 2007 | 5.7 | 52 |
| 2006 | 5.6 | 68 |
| 2010 | 5.6 | 40 |
| 2003 | 5.6 | 72 |
| 2014 | 5.6 | 338 |
| 1996 | 5.6 | 112 |
| 1997 | 5.6 | 54 |
| 1992 | 5.6 | 28 |
| 1990 | 5.6 | 52 |
| 1973 | 5.6 | 44 |
| 1979 | 5.6 | 20 |
| 1991 | 5.5 | 19 |
| 1984 | 5.5 | 24 |
| 1985 | 5.5 | 51 |
| 1993 | 5.5 | 27 |
| 1994 | 5.5 | 30 |
| 1995 | 5.5 | 42 |
| 2013 | 5.5 | 61 |
| 2001 | 5.4 | 73 |
| 1986 | 5.4 | 31 |
| 1983 | 5.4 | 56 |
| 1980 | 5.3 | 36 |
| 2018 | 5.3 | 18 |
| 1977 | 5.2 | 28 |
| 1978 | 5.2 | 34 |
| 1982 | 5.2 | 33 |
| 2016 | 5.1 | 36 |
| 1981 | 4.8 | 22 |