2008

6.3

1985

7.2

1967

6.3

1989

6.7

1987

6.6

1998

6.3

2007

6.4

2004

6.9

1994

6.6

1992

6.9

1982

6.1

2007

5.6

1994

7.1

2004

5.5

1992

5.3

2009

6.1

1989

6.4

2001

7.8

2010

2.0

1936

0.0