1964

7.4

1988

5.6

1962

6.9

1974

5.8

1985

6.7

1975

7.3

1985

4.8

1972

7.4

2003

9.3

1999

7.0

2005

7.3

2000

8.5

1983

7.6

1995

6.3

1989

6.0

1952

0.0

1977

5.5

1955

0.0

1999

3.0

1989

5.0