1932

7.5

1979

7.2

1940

7.8

2002

8.4

1997

7.6

1971

7.5

1981

7.1

1993

7.9

2001

6.1

2000

6.3

1995

6.0

2005

6.1

2006

8.2

1958

7.7

1971

7.0

2015

6.2

1987

7.1

1957

3.0

1985

6.2

1973

6.6