1984

7.2

1987

6.5

2000

7.3

1996

6.3

1999

6.6

2006

6.4

1998

7.2

1966

6.7

1955

7.1

1988

6.7

1983

6.5

2017

5.2

1994

5.6

1993

6.0

1988

5.5

2009

6.6

1941

7.1

2001

5.7

2006

5.9

1996

4.5