2000

0.0

1966

7.3

2004

7.8

1976

7.7

2005

6.5

1999

6.2

1990

7.7

1996

6.2

1996

6.7

2013

5.0

1987

5.2

2008

4.6

1945

6.0

1997

6.5

1971

6.9

1932

7.0

1957

5.7

1994

6.5

1991

6.8

1981

7.2