1968

6.3

1973

6.5

1998

6.6

1927

7.8

1989

5.2

2011

6.1

2015

5.1

1947

7.3

1990

7.3

2006

6.4

2001

6.4

1988

5.5

1975

7.2

2010

6.3

1958

8.2

1987

4.1

2011

7.0

1971

6.4

2003

6.7

2014

6.0