1997

7.2

1995

6.4

2000

7.6

2009

6.2

1994

6.3

2007

7.3

1993

3.2

2006

5.2

1996

7.0

2001

7.6

1995

4.0

1998

7.1

2010

6.3

1995

6.4

2003

7.8

1995

6.2