Number

Year

Rate

1

1988

11.1

2

1992

17.1

3

1993

18.8

4

1994

15

5

1995

14.2

6

1996

12.1

7

1997

14.4

8

1998

11.3

9

2000

13.0

10

2001

14.7

11

2002

15.3

12

2003

14.8

13

2004

14.3

14

2006

18.7

15

2007

-

16

2010

13.4