2005

7.1

1991

6.8

2004

6.5

1984

4.3

1967

6.6

1968

6.2

1981

4.5

1984

5.9

1934

6.4

1980

7.8

1997

8.5

1977

0.0

1991

8.0

2015

7.1

1955

6.3

1995

0.0

2006

5.6

2007

6.7

1960

6.0

1973

7.5