Assertion: tractor | /r/PartOf | 2 percent of the large trucks
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Source sentences:
text: Singles (truck tractors pulling a single semi-trailer) accounted for 59 percent of the large trucks involved in fatal crashes in 2017; doubles (tractors pulling two trailers) made up 2 percent of the large trucks involved in fatal crashes; and triples (tractors pulling three trailers) accounted for 0.3 percent of all large trucks involved in fatal crashes.
text: Singles (truck tractors pulling a single semi-trailer) accounted for 63 percent of the large trucks involved in fatal crashes in 2013; doubles (tractors pulling two trailers) made up 2 percent of the large trucks involved in fatal crashes; and triples (tractors pulling three trailers) accounted for 0.1 percent of all large trucks involved in fatal crashes.