We usually don't get hardware figures anymore, and Windows Central seems to be running monthly columns about it now, so here we go.
Source: http://www.windowscentral.com/xbox-playstation-neck-and-neck-npd-dec-2016Windows Central said:For the month of December, Xbox sold 1,511,000 units across both its Xbox One and Xbox One S consoles, which puts Xbox sales up 10% year-over-year for December. Sony took the sales lead selling 1,568,000 consoles during December, with 238,000 units of its PlayStation 4 Pro edging Microsoft into second place.