1989

4.9

1985

5.3

1992

6.7

2009

7.0

1992

6.9

1943

7.5

1968

6.0

1977

7.4

2008

7.7

1998

6.8

1995

5.9

2009

7.3

1983

5.5

1988

7.5

1992

7.8

1991

7.1

1986

8.0

1989

6.7

1932

7.4

1995

7.3