1995

7.0

1983

6.1

2009

6.3

1981

5.5

1973

5.6

2009

5.9

2004

6.4

2007

5.4

2007

4.5

2008

4.0

2007

4.0

1987

5.7

1982

5.8

1988

6.7

2003

5.0

2000

6.6

2004

4.2

1984

4.3

2001

5.7

1979

5.9