1983

6.6

1970

5.1

1981

3.8

1984

5.8

1974

6.7

1974

1.5

2008

4.1

2007

4.2

1987

5.6

1982

5.8

1975

3.3

1978

4.7

1970

1.0

1974

1.5

1976

3.0

1972

5.9

1972

3.0

1969

2.0

2014

5.7

1971

2.5