Year
Level I
Level II
Level III
2009
46%
41%
49%
2008
35%
53%
2007
39%
40%
50%
2006
48%
76%
2005
56%
55%
2004
32%
64%
2003
47%
68%
2002
44%
58%
2001
82%
2000
52%
54%
65%
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