1968

6.9

1972

1.0

1971

8.1

1982

7.5

2000

8.5

2003

3.5

1978

4.9

1989

4.9

2001

6.6

1975

5.5

1983

4.1

1989

6.0

1979

0.0

1969

4.8

1988

6.2

1980

5.9