1994

8.1

2005

8.2

2001

7.2

2000

8.0

1993

7.0

1996

6.8

2009

4.8

2005

6.5

2014

6.8

2010

6.7

2007

9.0

1992

5.8

2013

7.3

1997

6.5

2005

6.7

2009

8.0

2009

7.5

2002

8.1

2009

6.7