The VR world keeps expanding and United States is the main driver behind it. Customers there got 40% of all VR headsets shipped in the January-March quarter of 2017. Second is Japan with 14% or 81,000 VR units, with 9 out of 10 headsets being the PlayStation VR. The third most developed market for Virtual Reality headsets is China. 11% of all VR sets go to the Chinese market. HTC is an undisputable leader there with 15,000 shipped Vives or about a quarter of the whole market. Japan managed to jump in second due to heavy demand for Sony's in-house VR headset. According to Canalys...
Source: http://www.gsmarena.com/the_united_states_is_top_vr_market_in_q1_2017-news-25149.php