1998

8.2

1989

6.8

1986

6.5

2007

3.9

1997

2.7

1998

7.2

1993

7.0

1982

7.3

2009

4.1

1987

4.9

1985

6.9

1999

7.4

1995

7.6

2000

7.1

1982

5.1