1981

7.3

1943

5.4

2003

6.6

2004

5.8

2010

6.3

1987

5.5

1969

6.4

1959

7.2

1992

6.7

2002

6.4

1995

6.4

1993

6.4

1976

6.6

1932

6.4

1969

6.9

1996

6.1

2008

7.6

1998

6.3

1989

5.8

2008

6.9