2006

0.0

1977

6.8

1974

7.1

2013

6.9

1998

6.0

2007

5.4

1972

7.3

1999

6.5

1948

6.8

2008

5.9

2002

6.1

1987

7.3

1962

6.7

1988

4.8

2002

6.1

2004

6.1

1997

5.6

1999

5.5

1993

6.1

2010

0.0