1990

7.4

1972

7.8

1976

7.2

1987

7.5

1974

7.6

1980

5.1

1988

8.0

1984

7.4

1975

6.5

1982

5.1

1986

7.1

1989

4.3

1972

7.9

1983

7.6

2017

8.1

1986

6.7

1972

7.5

1977

7.1

1977

7.7