1996

6.4

2016

7.1

2013

5.5

1997

6.6

1999

7.9

2012

7.1

2007

4.4

2002

6.1

1998

8.2

2008

3.8

2010

7.4

2011

6.2

2003

6.6

2003

7.0

2001

6.8

2016

5.0

2015

4.1

1963

6.0

2003

7.6

2014

6.6

1993

6.1

2012

2.0

2002

7.6

2017

5.2

2018

5.4

2006

5.0

2017

5.4

2000

5.6

2001

3.5