1985

2.2

1988

7.4

1984

4.2

1984

7.2

1985

6.8

1981

7.6

1984

5.2

1983

4.7

1974

7.9

1985

5.1

1959

3.5

1986

5.7

1988

6.0

1985

7.7

1982

6.3