2005

5.2

2007

6.9

2007

6.9

1984

5.6

1988

5.8

1987

7.1

1992

7.3

1998

7.3

1989

8.1

2002

6.6

2010

2.8

2009

6.5

2004

7.2

2000

7.1

2007

7.0

2008

7.5

1974

6.1

2005

3.9

2008

5.3

2008

6.7