1994

5.6

2005

5.8

2003

6.7

1994

7.2

2004

7.2

1994

5.7

1998

6.8

1991

6.8

2006

8.0

1990

6.1

1991

6.1

1999

5.3

1995

2.8

1997

7.6

2001

7.5

1997

5.4