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In the interest of not citing 12+ year old studies relying on 17+ year old data, 2013 usage was 87% and since 1995 there have only been two years of decreasing average usage[0], '05-'06 (82-81%) and '10-'11 (85-84%).

[0] http://www-nrd.nhtsa.dot.gov/Pubs/811875.pdf




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