VGChartz' William D'Angelo: "The Xbox One in 2015 sold 8.45 million units, a seven percent increase year-over-year, to bring its lifetime sales to 19.43 million units. 64.05 million games were sold at retail on the Xbox One in 2015 and has now sold 112.09 million games lifetime.
The Xbox One proved most successful in the US, but also sold modestly well in Europe. It sold 4.92 million units in Europe, 2.09 million units in Europe, and just 18,907 units in Japan.
19 games for the console in 2015 managed to sell over one million units and six games sold more than two million units."