Android (operating system) and rival Linux mobile operating systems that were in development. These established players were skeptical: Nokia was quoted as saying "we don't see this as a threat," and a member of Microsoft's Windows Mobile team stated "I don't understand the impact that they are going to have." Since then Android has grown to become the most widely used smartphone operating system and "one of the fastest mobile experiences available". Reviewers have highlighted the open-source nature of the operating system as one of its defining strengths, allowing companies such as Nokia (Nokia X family), Amazon (Kindle Fire), Barnes & Noble (Nook),
Plug-in electric vehicles in the United States to 194,479 in 2017, up 23.7% from 2016. The market share of plug-in electric passenger cars increased from 0.14% of new car sales in 2011 to 0.37% in 2012, 0.62% in 2013, and reached 0.75% of new car sales during 2014. As plug-in car sales slowed down during the 2015, the segment's market share fell to 0.66% of new car sales, with the all-electric segment flat at 0.41%, while plug-in hybrids declined to 0.25% from 0.34% in 2014. The plug-in market share increased to increased to 0.90% in 2016, and achieved the 1% market share mark for the first time