2001

7.8

2005

6.1

2002

6.4

2013

5.2

2014

6.0

2017

6.7

1993

7.7

1992

5.0

2004

3.8

1964

6.4

1989

6.0

2008

6.8

1940

5.0

2010

7.5

1991

5.8

2016

7.9

2012

7.0

1998

5.8

2011

5.0

2016

5.3