1934

5.3

2013

7.4

2005

6.1

1981

7.2

1994

5.8

2001

7.0

1940

7.1

1986

6.3

1970

6.9

1980

5.3

2003

6.3

1997

5.0

2005

7.3

2007

7.6

2015

6.1

1987

6.1

2000

6.5

1951

7.2

1951

5.0

2004

7.1