1997

7.3

1995

6.4

2000

7.6

2009

5.9

1994

6.2

2007

7.3

1993

2.9

2005

6.1

2006

5.2

1996

7.1

2001

7.6

1995

4.8

1998

7.1

2010

6.1

1995

6.4

2003

7.8

1995

6.2