2002

7.1

2002

3.7

1991

6.1

1990

6.0

1988

6.8

2003

6.3

2003

6.3

2004

6.1

2006

4.8

2006

5.1

2000

6.1

1985

5.3

2004

5.9

1994

6.4

2001

4.4

2006

5.0

2008

5.5

2006

5.7

2008

5.6

1975

7.3