Less than $30,000 $30,000-$49,999 $50,000-$74,999 $75,000+
3/31/2000 0% 0% 1% 2%
9/10/2001 2% 4% 8% 20%
9/19/2001 3% 8% 10% 16%
10/1/2001 2% 5% 8% 14%
10/7/2001 3% 4%
10/18/2001 4% 5% 10% 19%
11/18/2001 4% 7% 11% 18%
12/23/2001 4% 7% 10% 23%
1/31/2002 4% 6% 11% 22%
5/19/2002 5% 8% 13% 25%
7/26/2002 4% 10% 14% 23%
10/6/2002 6% 11% 26% 32%
10/27/2002 7% 10% 12% 26%
11/24/2002 7% 13% 16% 34%
12/22/2002 5% 12% 16% 27%
3/24/2003 7% 11% 22% 32%
3/25/2003 7% 11% 22% 33%
5/20/2003 7% 14% 25% 30%
6/24/2003 7% 14% 21% 37%
8/3/2003 8% 14% 22% 38%
12/14/2003 9% 16% 25% 42%
3/1/2004 10% 23% 36% 46%
3/17/2004 13% 25% 27% 49%
6/17/2004 12% 18% 31% 48%
7/3/2004 12% 19% 35% 48%
11/22/2004 13% 25% 34% 54%
11/30/2004 12% 24% 37% 50%
2/9/2005 15% 27% 32% 58%
3/21/2005 15% 27% 38% 56%
6/7/2005 18% 29% 44% 63%
12/8/2005 21% 30% 46% 64%
12/31/2005 17% 30% 52% 63%
2/6/2006 22% 32% 51% 67%
3/28/2006 29% 40% 52% 69%
4/6/2006 22% 44% 49% 68%
8/31/2006 22% 39% 56% 74%
12/4/2006 26% 44% 50% 77%
12/30/2006 24% 46% 61% 73%
12/2/2007 40% 52% 69% 78%
1/13/2008 28% 51% 61% 77%
5/11/2008 31% 53% 67% 82%
8/10/2008 38% 59% 68% 79%
8/31/2008 36% 53% 71% 83%
12/4/2008 31% 61% 73% 85%
12/20/2008 33% 57% 69% 83%
4/19/2009 39% 61% 79% 85%
6/21/2009 45% 53% 83% 87%
9/14/2009 42% 66% 82% 88%
12/27/2009 41% 62% 78% 83%
1/19/2010 45% 61% 74% 87%
5/30/2010 42% 65% 79% 87%
9/13/2010 40% 64% 80% 88%
11/24/2010 42% 66% 75% 89%
12/21/2010 41% 65% 81% 88%
5/22/2011 40% 70% 79% 88%
8/26/2011 41% 65% 81% 89%
1/8/2012 47% 67% 81% 88%
2/19/2012 45% 64% 82% 91%
4/3/2012 46% 68% 85% 87%
11/10/2012 47% 71% 83% 90%
12/9/2012 46% 69% 79% 89%
5/19/2013 54% 70% 84% 88%
9/30/2013 52% 71% 85% 91%
4/12/2015 44% 72% 83% 90%
7/12/2015 47% 64% 78% 89%
11/15/2015 45% 68% 81% 88%
4/4/2016 49% 73% 80% 91%
11/6/2016 53% 71% 83% 93%
1/10/2018 45% 67% 79% 87%
2/7/2019 56% 72% 87% 92%
2/8/2021 57% 74% 87% 92%