The accompanying table shows data on the total number of people in the United States and the number of all people who were uninsured, for selected years from 2005 to 2017.

It also shows data on the total number of poor children in the United States — those under 18 and below the poverty threshold — and the number of poor children who were uninsured.

For each year, calculate the percentage of all people who were uninsured and the percentage of poor children who were uninsured. How have these percentages changed over time? What is a possible explanation for the change in the percentage of uninsured poor children?

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Year Total people Uninsured Total poor people children (millions) 2005 293.8 44.8 Uninsured poor children 12.9 8.0 2007 299.1 45.7 13.3 8.1 2009 304.3 50.7 15.5 7.5 2011 308.8 48.6 16.1 7.0 2013 313.1 41.8 15.8 5.4 2015 318.4 29.0 14.5 4.5 2017 322.5 28.5 12.8 3.8 Data from: U.S. Census Bureau.