1984

7.6

1992

7.4

1990

6.0

1986

4.8

1989

5.0

1986

5.3

2004

4.1

1988

3.8

1999

4.5

1974

0.0

1973

5.4

1972

7.9

1995

5.0

1975

6.6

1974

4.1

1977

7.2

1987

8.0