[["", "2017", "2016", "2015"], ["statutory u.s . federal tax rate", "35.0% ( 35.0 % )", "35.0% ( 35.0 % )", "35.0% ( 35.0 % )"], ["state taxes net of federal benefit", "2.1", "3.7", "3.0"], ["domestic production activities deduction", "-1.0 ( 1.0 )", "-1.3 ( 1.3 )", "-1.3 ( 1.3 )"], ["increase ( decrease ) in domestic valuation allowance", "-0.1 ( 0.1 )", "-4.7 ( 4.7 )", "0.1"], ["impact of revised state and local apportionment estimates", "3.1", "0.5", "-0.7 ( 0