1983

5.9

1990

7.7

2004

5.5

1992

8.0

1959

6.9

2000

6.4

1956

7.5

1997

6.1

1984

6.3

1978

6.6

1991

0.0

1996

0.0

1954

6.8

1973

7.5

1950

7.7

1971

3.5

2012

5.2

2014

5.8

2001

7.8

2004

7.3