2001

7.8

2011

6.1

1964

5.4

1996

6.7

2012

7.2

1994

4.4

2016

7.3

2013

7.5

2005

6.6

1998

5.5

2004

4.9

2013

7.5

2013

6.2

1997

6.0

1999

3.0

2009

6.0

2014

6.1

2005

5.3

2008

2.0

2003

6.0

1999

5.7

2012

6.6

2006

5.2

2017

6.4