1999

7.5

2006

7.1

2006

6.1

2005

8.8

2000

6.2

2005

7.4

2002

8.2

2001

8.0

2013

7.0

2004

8.0

2009

8.5

1999

7.7

1995

7.7

2005

5.0

1980

0.0

2002

7.4

2013

7.5

1979

6.6

2013

10.0

2017

6.4