2000

5.4

2010

0.0

1981

4.9

1998

6.1

1994

7.6

1996

6.4

2007

6.7

1980

3.8

1997

5.0

2010

7.7

1988

2.0

1992

5.0

2003

4.8

2011

8.2

2009

6.0

2013

4.0

2009

6.9

1993

6.0