1974

6.7

1991

6.5

1954

6.1

1968

5.3

1975

6.3

1980

6.2

1993

6.2

1990

6.3

1968

6.3

1980

6.4

1990

5.8

1973

7.1

1965

6.9

1990

6.3

1988

6.8

1971

6.6

1972

6.5

1982

6.0

1977

6.6

2018

6.8