1969

7.3

2015

7.8

1990

6.5

1968

7.5

1975

5.0

1988

6.7

1982

1.0

1972

6.8

1970

4.3

1973

6.7

1974

5.9

1969

5.6

1995

6.7

1934

0.0

1971

6.2

1977

6.5

1978

5.3

1970

5.4

2009

4.7

1974

5.8