1997

3.9

2001

6.5

1993

6.1

1994

0.0

2009

8.0

1998

5.4

2007

7.7

1997

2.0

2001

7.2

2000

7.6

2004

7.9

1993

7.7

2005

8.1

1990

5.0

2005

8.2

2012

7.7

1992

5.9

2009

7.9

2013

7.3

2005

7.0

2012

7.2

2007

7.5

1988

6.8

2014

6.7

1991

6.0

2009

7.1

2003

7.5

2003

5.5

2002

7.3