I think I remembered wrongly. State income tax was zero, not sales tax (which is 6 percent). Your question remains valid, though.
http://www.fool.com/investing/general/2013/04/05/the-7-states-with-no-income-tax.aspx
New Hampshire has neither income tax nor state tax.
http://commonwealthmagazine.org/politics/the-download-how-does-new-hampshire-do-it/
Getting back on track, Tim Howard is from New Jersey, so his save percentage should be 7%.