1984

6.8

2001

5.0

1999

7.6

1987

5.5

2002

6.7

2005

7.5

1986

4.9

1985

4.8

2004

7.6

1992

5.2

1988

0.0

1979

6.8

1992

0.0

1989

4.5

1993

6.1

1994

8.4

1989

0.0

1985

5.9