1993

5.7

2002

5.0

1998

4.3

2003

3.3

2004

6.7

2015

0.0

2009

5.7

1991

0.0

1999

5.7

2000

4.8

2008

6.8

2000

9.0

1995

7.8

1997

7.7

2012

7.5