| Less than $30,000 | $30,000-$49,999 | $50,000-$74,999 | $75,000+ | |
|---|---|---|---|---|
| 2000 | 34% | 58% | 72% | 81% |
| 2001 | 36% | 60% | 75% | 84% |
| 2002 | 39% | 64% | 76% | 85% |
| 2003 | 41% | 66% | 81% | 87% |
| 2004 | 44% | 68% | 83% | 88% |
| 2005 | 49% | 73% | 86% | 92% |
| 2006 | 52% | 75% | 86% | 92% |
| 2007 | 58% | 74% | 86% | 93% |
| 2008 | 54% | 78% | 88% | 95% |
| 2009 | 60% | 79% | 92% | 95% |
| 2010 | 61% | 81% | 88% | 95% |
| 2011 | 64% | 85% | 90% | 97% |
| 2012 | 70% | 87% | 93% | 97% |
| 2013 | 72% | 86% | 93% | 97% |
| 2014 | 74% | 86% | 93% | 96% |
| 2015 | 76% | 86% | 94% | 97% |
| 2016 | 79% | 90% | 95% | 98% |
| 2018 | 81% | 93% | 97% | 98% |
| 2019 | 82% | 93% | 97% | 98% |
| 2021 | 86% | 91% | 98% | 99% |
- Report
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