1985

7.2

2002

6.1

2001

6.9

1977

7.4

1991

6.0

2001

6.8

2007

6.9

2006

5.1

1933

0.0

1966

4.0

1996

6.7

1995

7.3

2000

7.1

1977

0.0

1997

3.9

1987

5.4

2002

6.9

1950

6.8

1988

5.9

1984

0.0