1995

6.5

2005

6.3

1963

8.1

1997

6.7

2013

3.7

2006

6.7

2000

6.5

1956

6.2

2004

6.1

1997

6.9

1985

7.2

1927

7.8

2001

6.7

1980

6.2

1987

5.1

2002

6.0

1992

7.1

1998

6.3

1999

6.9

2004

6.5