1994

8.0

1998

0.0

1996

6.1

1996

6.5

1987

5.8

1995

7.3

2001

6.8

1997

6.7

2000

8.5

2009

6.0

1998

3.2

2007

6.8

2010

2.9

1990

6.9

2001

0.0