1987

7.1

2004

7.7

1977

6.8

1980

7.5

1988

6.5

1986

5.3

1979

6.0

1980

7.2

1977

6.1

1982

7.6

1992

8.5

1987

6.3

1977

6.0

1992

8.0

1981

7.8