1968

3.7

1970

4.7

1974

6.0

1963

6.2

1976

4.5

1962

6.2

1967

5.5

2001

4.5

1997

4.0

2016

6.1

2006

2.3

1940

7.5

1941

0.0

1994

5.3

1959

3.0

2005

0.0

1941

0.0