1985

5.0

1997

7.3

1990

5.1

1993

7.1

1988

5.8

1992

7.3

1986

10.0

2000

5.5

1989

6.3

1991

6.1

1987

8.4

2009

7.6

1997

7.7

1989

5.8

1993

7.2