2005

7.1

2007

7.3

2006

6.9

2014

5.4

1931

8.3

1998

6.8

2004

8.1

1997

5.7

1989

6.3

2012

5.9

1959

7.3

1952

6.4

1986

7.3

2012

6.9

1930

6.6

1965

6.0

2011

7.5

1939

6.3

1950

6.7

1934

6.0