2007

7.0

1989

6.3

1987

6.9

2006

6.6

1979

7.2

2006

6.2

2006

6.6

1992

7.4

1981

1.0

2008

8.1

2002

5.8

1965

4.3

2001

6.5

2010

7.8

1995

6.5

1996

6.1

2001

5.3

1996

6.7

1940

7.1

2008

5.8