1976

0.0

1983

6.3

1992

7.0

2003

6.9

2008

6.5

1940

4.3

2013

6.5

1996

2.7

1995

6.5

2003

7.2

1979

5.0

1999

6.6

1998

7.4

2002

6.1

2007

8.1

2005

5.9

2005

6.7

2007

7.1

1998

6.6

2006

5.8