 A study by The NPD Group found that awareness of Blu-ray Disc had reached 60% of U.S. households.Nielsen VideoScan sales numbers showed that for some titles, such as 20th Century Fox's "Hitman", up to 14% of total disc sales were from Blu-ray, although the average Blu-ray sales for the first half of the year were only around 5%.In December 2008, the Blu-ray Disc version of "The Dark Knight" sold 600,000 copies on the first day of its launch in the United States, Canada, and the United Kingdom.