1983

7.6

2008

6.5

2006

5.8

2013

7.5

2005

6.8

1969

6.4

1973

6.9

2008

6.8

1927

5.2

2008

6.2

1968

7.4

1892

4.7

1892

3.7

1978

6.8

2009

6.9

2008

7.8

1953

6.7

1995

6.1

1996

6.9

2005

6.7