1981

6.6

2009

0.0

1984

0.0

1985

6.4

1992

7.0

2004

7.6

1995

5.8

1986

7.3

1985

5.3

1993

6.1

1983

7.0

1999

6.7

1992

5.9

1987

6.3

1989

5.8

1989

0.0

1984

5.5