1982

6.9

2013

6.8

1997

7.3

2005

6.8

1995

7.2

1998

7.1

1985

7.2

1997

7.6

2000

8.0

1955

7.2

2000

5.9

1979

8.3

2014

5.6

1975

4.9

1992

7.1

1987

6.6

1962

7.9

2008

7.4

2005

6.3

1968

7.4