1981

5.2

1983

0.0

1984

5.8

1984

6.8

1982

6.9

2009

6.7

1990

7.4

1985

4.9

1987

5.0

1981

7.5

1980

6.5

1970

7.1

1971

6.9

1986

0.0

1981

4.3