2008

6.9

1981

7.1

1985

6.4

1986

5.8

1999

6.8

2001

6.9

1984

6.5

1978

7.2

1932

7.4

1991

7.6

1954

7.9

1947

7.6

1990

8.5

1992

6.8

2007

6.7

2002

5.3

2000

6.5

2001

5.9

1977

0.0

2013

4.5