1996

6.2

1996

6.5

2011

8.1

2009

8.0

2010

7.9

2000

7.6

1992

5.0

2002

8.6

2006

7.9

2005

7.9

1987

7.2

1994

7.5

1975

7.2

2003

6.8

2017

0.0

2004

6.8

1996

5.4

0.0

2012

5.7

2013

7.5