Less than $30,000 $30,000-$49,999 $50,000-$74,999 $75,000+
3/21/2005 3% 6% 8% 7%
12/8/2005 5% 9% 9% 15%
8/31/2006 8% 16% 9% 10%
5/11/2008 23% 23% 19% 25%
8/10/2008 27% 28% 28% 30%
8/31/2008 22% 26% 33% 28%
12/4/2008 24% 34% 27% 35%
12/20/2008 26% 29% 27% 32%
4/19/2009 30% 39% 43% 47%
9/14/2009 32% 40% 43% 50%
12/27/2009 37% 43% 47% 53%
1/19/2010 39% 43% 48% 49%
5/30/2010 42% 54% 50% 60%
9/13/2010 38% 48% 54% 63%
11/24/2010 39% 46% 53% 57%
11/28/2010 40% 50% 50% 58%
12/21/2010 39% 52% 59% 60%
5/22/2011 42% 60% 56% 66%
8/26/2011 42% 54% 55% 64%
2/19/2012 46% 58% 57% 68%
8/7/2012 55% 59% 61% 73%
12/9/2012 48% 56% 60% 65%
5/19/2013 57% 63% 69% 68%
7/14/2013 52% 59% 63% 71%
9/30/2013 58% 64% 70% 73%
1/26/2014 58% 64% 67% 74%
7/12/2015 56% 69% 72% 78%
11/6/2016 60% 71% 73% 78%
1/10/2018 63% 74% 74% 77%
2/7/2019 68% 70% 83% 78%
2/8/2021 69% 76% 65% 78%