2007

6.6

2008

5.5

2009

6.0

2009

7.6

2009

5.0

1983

7.0

1979

7.0

2005

6.7

1984

8.4

2003

7.7

1990

7.5

1998

6.7

2006

6.9

1996

6.8

2005

5.9

1991

7.6

2002

7.3

2003

6.0

2001

6.0

1994

7.2