2005

6.7

1986

7.0

2005

5.8

1985

6.5

2002

5.5

1960

5.9

1989

7.4

2003

5.9

1973

6.8

1997

6.1

2001

6.0

1948

6.1

2014

4.8

1995

4.7

1993

0.0

1987

5.7

2008

6.5

2007

5.9

1996

6.2

2000

6.5