2017

6.2

2007

6.1

1997

6.1

1973

4.8

1967

3.3

1982

0.0

1975

8.0

2006

8.0

1972

7.8

1988

6.2

1985

7.1

1998

6.8

1939

4.7

2008

7.2

1980

4.0

1976

7.9

1990

6.6

1958

5.7

1995

7.2

1976

6.0