Year after year, Call of Duty continues to maintain its success, despite changes in market trends along with the ups and downs of the video game industry. Even when major changes to the series arise, like traveling to space, going to the distant future, or completely removing its single-player campaign mode, the games print money. Today, Activision thanked fans via their blog as 2018 marks the tenth year in a row in which Call of Duty is the best-selling video game franchise in the US, with Black Ops 4 taking the top spot last year. These stats come from the NPD group, a market research company that tracks video game sales.
Source: N4G PC Activision Thanks Fans as Call of Duty is the Best-Selling Console Series for 10 Years in a Row