1972

0.0

0.0

1984

7.5

1967

7.3

1960

0.0

1978

7.1

1991

7.6

1999

8.2

1994

8.1

1991

6.3

1989

7.9

1996

6.9

2004

6.5

1961

6.6

1983

7.9

1998

7.8

1984

6.4

1999

6.4

1993

7.9

2004

3.5