1979

6.2

1985

6.0

1997

5.4

2009

6.5

2000

6.5

2004

5.8

1947

6.1

1916

0.0

1951

6.3

2011

5.9

2004

5.7

1974

6.0

2009

6.9

2009

6.1

1994

5.8

1976

4.6

2001

6.9

1979

7.1

1992

8.0

2016

6.7