From 2001 to 2011, renters with very low incomes (those making less than $20,000 annually) increased in number by three million to 11.8 million, according to a report (pdf) by the Joint Center for Housing Studies at Harvard. During the same time period, the number of affordable apartments held steady at about seven million. In 2000, the share of renters paying more than 30% of their income for housing was 38%. By 2010, the share had risen to 50%.
   
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