Year
|
Percent
|
1997
|
68.5%
|
1998
|
69.1%
|
1999
|
68.7%
|
2000
|
68.3%
|
2001
|
68.4%
|
2002
|
67.4%
|
2003
|
67.5%
|
2004
|
66.5%
|
2005
|
66.5%
|
2006
|
65.9%
|
2007
|
66.0%
|
2008
|
66.0%
|
2009
|
66.3%
|
2010
|
65.7%
|
2011
|
65.6%
|
2012
|
65.8%
|
Source: CDC/NCHS, National Health Interview Survey, 1997-2012
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