1990

4.2

1985

5.3

1986

6.0

1985

1.0

1992

7.4

1994

0.0

1978

2.5

2001

8.5

1985

6.1

1975

4.2

1987

4.6

2002

10.0

1995

7.5

1978

0.0

1987

5.1

2000

6.7

1999

5.8