1982

6.0

1987

6.6

1983

7.4

1992

6.5

1986

5.6

1995

7.2

1997

6.5

1949

7.1

1943

6.4

1984

7.3

1985

6.7

2012

5.7

2000

3.3

1988

4.5

1990

6.7

1995

5.9

1992

4.2

2001

6.9

1979

4.7

1998

6.8