1972

6.8

1986

6.7

1974

6.0

2003

8.0

1994

7.1

1979

6.7

1985

6.7

2004

6.3

1980

5.0

1985

0.0

1973

7.0

1979

6.1

1964

0.0

1972

8.0

1980

6.8

2000

6.1

1997

10.0

1959

7.5

1954

5.5

1986

6.0