1970

6.1

1979

6.2

1982

6.4

1970

5.2

1966

5.3

1979

4.8

2002

7.3

1966

5.3

2017

7.7

1986

5.7

1968

5.8

1973

6.9

1968

7.5

1977

6.5

1978

6.3

1972

7.0

1972

5.8

1976

7.5

1978

5.4

1972

4.0