1984

7.6

2007

6.8

1987

6.8

2004

6.8

1968

7.1

1980

7.3

1976

6.6

1990

7.9

1978

5.5

2001

6.9

1979

5.7

1983

5.0

1995

5.7

1994

5.4

1991

6.2