1990

7.3

2005

5.9

2004

7.9

2008

6.6

2009

5.7

1993

7.7

2014

7.9

2005

7.5

1995

7.8

1994

7.0

1996

7.0

1995

6.0

2004

2.2

2000

3.8

2003

5.8