Cumulative global sales of highway legal plug-in electric passenger cars and light utility vehicles reached the one million unit milestone in September 2015,[17][18] and achieved two million in December 2016.[1] Sales of plug-in electric vehicles achieved the one million milestone almost twice as fast as hybrid electric vehicles (HEV). While it took four years and 10 months for the PEV segment to reach one-million sales, it took more than around nine years and a few months for HEVs to reach its first million sales.[17][18] The stock of light-duty plug-in electric vehicles represented 0.15% of the 1.4 billion motor vehicles on the world's roads by the end of 2016, up from 0.1% in 2015.[1][5] When sales are broken down by type of powertrain, all-electric cars have oversold plug-in hybrids, with pure electrics capturing about 61% of the global stock of over 2 million plug-ins on the world's roads by the end of 2016,[2] up from 58.9% at the end of 2015.[3] The global ratio between all-electrics (BEVs) and plug-in hybrids (PHEVs) has consistently been 60:40 between 2014 and the first half of 2016, mainly due to the large all-electric market in China. In the U.S. and Europe, the ratio is approaching a 50:50 split.[19] Cumulative global sales of highway-capable light-duty pure electric vehicles since 2010 achieved the one million unit milestone in September 2016.[4] Cumulative sales of plug-in hybrid cars totaled almost 800,000 units as of December 2016.[2]