1937

7.4

2000

6.6

2010

7.9

2012

9.4

2013

8.1

1961

8.4

1954

7.8

2011

7.6

1944

6.3

2000

6.9

1943

7.5

1955

7.1

2002

6.0

1971

7.2

2011

7.4

1988

7.5

1940

7.1

2011

9.1

1994

5.5

1971

6.8