1973

5.6

1997

6.1

2002

4.7

2016

6.8

1972

6.8

1933

7.2

2004

7.1

1991

5.5

2015

7.6

1974

6.5

2014

6.5

1956

6.9

2004

5.2

2014

6.6

2001

6.6

1987

6.6

1950

7.1

1993

6.6

1978

7.2

2003

6.3