CAFE has separate standards for "passenger cars" and "light trucks" even if the majority of "light trucks" are being used as passenger vehicles. The market share of "light trucks" grew steadily from 9.7% in 1979 to 47% in 2001, remained in 50% numbers up to 2011. More than 500,000 vehicles in the 1999 model year exceeded the GVWR cutoff and were thus omitted from CAFE calculations. More recently, coverage of medium duty trucks has been added to the CAFE regulations starting in 2012, and heavy duty commercial trucks starting in 2014.