1984

7.4

1986

4.8

1977

7.7

2011

5.4

1970

6.5

1977

8.2

1979

6.8

1993

5.9

1989

4.5

1974

7.0

2003

7.6

1983

6.7

1976

7.2

1975

5.9

1973

6.0