2012

7.4

1968

5.7

2007

7.6

1976

5.4

1970

5.9

2008

7.5

1974

5.0

1979

4.7

1977

6.0

1967

7.0

1970

5.0

1975

5.3

1978

5.0

1978

5.0

1971

4.4

1977

5.3