1989

2.7

1998

5.6

1997

6.7

1995

7.5

2006

4.8

1986

0.0

1993

6.7

2005

5.4

1994

0.0

1987

4.5

2000

7.0

1983

6.1

1995

7.7

1990

0.0

1994

6.0

1988

6.2

2011

6.1