1996

7.5

2003

7.9

2009

7.6

2000

5.1

2000

7.6

2004

7.9

1996

5.5

1994

7.8

2000

4.4

2012

6.0

2009

6.8

2006

7.1

1985

3.7

2013

4.6

2000

8.5

1987

7.7

2002

7.9

2004

6.8

2001

8.0

2010

6.8

1993

8.4

2008

7.6