1997

6.3

2000

6.1

1929

7.4

1940

7.4

1961

8.1

2012

7.7

2011

7.6

1977

6.7

1975

8.0

2015

6.1

2011

7.5

1966

7.3

1998

7.1

2017

6.1

1998

5.4

2014

8.1

1955

7.9

2018

6.4

1975

7.3

2015

7.8