1999

8.2

2003

7.1

2003

6.7

2006

6.2

2000

6.3

1998

7.1

1998

6.5

2001

6.9

2001

4.5

2004

6.6

1993

6.5

1984

7.2

0.0

2000

8.1

1974

6.5

2006

6.8

1991

6.2

1990

6.7

1993

5.5

2004

6.4