1993

5.1

1996

4.7

1995

7.0

2013

5.2

2007

7.1

2005

5.6

2013

5.4

2017

6.0

2008

6.3

2005

4.9

2011

1.0

2014

6.6

1984

4.5

2015

5.3

2002

5.4

2004

8.0

1992

5.4

1992

4.0

1999

5.6

2002

6.5