2004

7.4

2014

6.4

1968

7.3

1970

7.1

2007

6.6

1995

7.3

2004

6.6

2004

6.3

1965

5.7

1970

6.5

1980

6.1

1983

6.2

1983

5.8

1976

7.2

1973

7.0

1977

6.6

1985

5.7

1986

3.0

1986

6.3

1986

5.7