1995

6.5

2007

6.9

2003

6.2

2016

4.2

2000

5.8

2009

7.5

2015

3.0

2004

5.6

2004

3.1

2004

3.8

1992

4.9

2017

1.0

2003

4.5

1974

3.6

2007

7.4

2009

4.7

1996

7.7

2010

5.9

2016

6.8

2013

5.8