1950

7.1

1960

8.0

2006

6.3

1986

7.7

1974

6.5

2015

6.2

1972

6.8

1933

7.2

1989

7.3

1962

7.9

2006

6.1

1964

7.0

2009

6.6

1959

7.3

1969

6.0

2002

6.2

1939

7.9

1968

6.5

2007

6.6

1945

7.6