1997

7.2

2000

0.0

1996

7.7

1993

0.0

2006

4.7

2012

5.8

1998

6.8

2001

8.2

1994

6.2

2002

5.7

1991

7.1

2001

6.9

1995

7.7

1996

7.1

1993

8.4

1987

6.5