2012

4.8

1998

6.1

1992

7.4

2007

4.3

2006

3.6

2006

5.5

1981

0.0

1997

8.3

2011

10.0

2005

6.1

2001

6.9

1995

7.7

1985

6.0

1996

7.1

1993

8.4

2009

7.3

2013

7.4