1987

7.1

2007

2.0

1993

5.1

1989

5.9

1990

7.4

1985

7.2

1994

6.3

1993

7.4

1990

0.0

1993

5.5

1998

8.5

1997

4.2

1998

4.2

1996

5.4

1991

6.0

1991

5.1

1990

0.0

2006

6.3