1939

7.8

2007

10.0

2010

5.8

2014

5.3

2003

6.3

1970

6.3

1952

6.7

5.0

1989

7.3

1966

7.2

1912

6.1

2004

6.8

2001

4.9

2005

6.8

1978

5.3

1960

7.8

2002

7.7

2009

6.0

2011

6.9

2013

5.0