1970

4.7

1974

6.0

1963

6.2

1962

6.2

1976

4.5

1968

3.7

1967

5.5

2010

5.3

1951

6.0

2001

7.0

1997

7.7

1979

6.1

2009

3.7

1941

6.6

1940

5.6

1941

5.9

1983

4.1

2009

2.1