1993

4.8

2002

5.5

1998

4.3

2003

3.3

2004

6.8

2015

10.0

2009

4.8

1991

0.0

1999

5.7

2000

4.8

2000

9.0

2008

6.8

1995

7.8

1997

7.7

2012

7.5

2003

0.0