1976

10.0

1974

8.0

1972

7.5

1973

8.0

1978

9.7

1981

6.0

1968

0.0

2019

6.6

2001

5.6

1985

6.7

2002

7.6

1975

7.3

1987

8.2

2006

5.1

1960

7.4

2003

6.2

1988

7.7

1999

7.7

1993

6.8

1989

6.8