A new report from Loup Ventures analyst Gene Munster estimates that 31 percent of iPhone users have made at least one purchase with Apple Pay in the past year, bringing the total number of Apple Pay users to around 252 million. This represents an increase of 7 percent from a year ago. These numbers are only educated estimates, however, as Apple does not release specifics on Apple Pay adoption, however Munster is basing his analysis on Apple CEO Tim…