Why does Wyoming has the smallest share of its population on food stamps — 7% - and registered double-digit year-over-year jump in use?

Population, 2012 estimate     576,412   
High school graduate or higher, percent of persons age 25+, 2007-2011     91.9%
Home-ownership rate, 2007-2011     70.5%
Housing units in multi-unit structures, percent, 2007-2011     15.7%
Median household income, 2007-2011     $56,380
Persons below poverty level, percent, 2007-2011     10.1%   
Land area in square miles, 2010     97,093.14   
Women-owned firms, percent, 2007     25.5%