1990

6.1

1988

7.2

1990

5.9

1974

6.4

1992

5.3

1941

7.0

2011

6.9

1966

6.6

2006

5.8

1993

5.0

1959

7.8

1986

6.0

1986

7.6

2008

7.5

2009

6.3

1940

7.1

1980

6.0

1998

7.1

1995

6.4

1976

6.6