1995

7.0

1990

6.9

1989

5.7

2004

9.0

2005

8.0

2006

8.2

1993

5.5

1983

7.2

1989

4.6

1991

4.6

2007

0.0

2003

6.2

2004

6.0

1988

0.0

1988

5.2

1986

6.3

1990

5.2

1990

7.3

1994

0.0

1992

7.0

1999

7.6