1996

6.4

0.0

1994

2.5

2009

4.9

2009

6.7

1997

6.7

2015

0.0

2017

6.2

2002

6.0

1995

7.6

2005

0.0

1995

6.5

1998

7.1

1991

5.9

2007

7.5

2012

5.5

2010

6.7

2018

7.0