1968

0.0

1998

8.2

2001

4.5

1990

10.0

1983

6.4

1965

3.0

1982

5.7

1969

6.1

1966

7.5

1989

8.0

1993

7.0

1975

5.5

1970

7.8

1982

1.0

1974

6.0

1973

0.0

1984

7.4