1997

7.2

1995

6.4

2000

7.6

2009

5.9

1994

6.1

2007

7.3

1993

2.8

2005

5.5

2006

5.3

1996

7.0

2001

7.6

1995

4.8

1998

7.1

2010

6.1

1995

6.4

2003

7.8

1995

6.2