2000

4.9

1987

5.5

1981

8.0

1993

6.2

1988

6.4

1990

7.4

2001

7.6

1995

7.3

1991

5.7

1983

6.0

1998

7.4

1991

6.7

1984

7.2

2009

7.6

1988

0.0