1927

8.1

1972

6.4

1951

7.4

1986

6.6

2005

7.0

1986

7.1

2007

6.8

2004

7.0

2014

6.9

2013

4.6

1991

6.3

1954

7.6

1955

6.0

2015

7.5

1945

6.1

1994

5.9

2001

7.0

1956

7.2

1998

5.4

1999

7.3