1973

6.9

1932

7.4

1946

7.8

1971

6.3

2018

6.5

2015

6.7

2017

6.6

1977

6.6

2016

4.9

1996

5.7

2011

7.1

2007

6.3

2009

6.7

2016

7.0

1967

7.6

2016

7.3

2007

6.1

1955

7.2

1980

5.8

1976

7.8