2002

5.2

1982

6.2

1997

7.6

1975

4.5

1991

5.3

2013

8.1

2011

7.2

2014

5.7

2011

4.9

2004

4.7

2013

7.6

2004

5.4

2012

6.5

2015

5.3

2012

4.3

1998

7.2

2011

5.0

2009

6.7

2014

5.6