1959

7.4

1951

7.3

2013

6.2

1969

7.3

2007

7.1

1940

7.0

2009

7.5

1995

7.4

1963

5.1

2017

5.4

2008

5.9

1931

7.2

1961

8.3

1981

6.9

1984

6.7

1998

6.2

1945

7.6

1952

5.8

1981

6.6

1991

7.3