The six-time world champion Chicago Bulls are members of the National Basketball Association (NBA). The team is celebrating its 50th season in 2015-16, and marking its 21st season playing in the United Center, which has hosted more than 40 million people since its opening in 1994. An iconic sports brand with local roots and global presence, the Bulls have more than 93 million fans worldwide and annually share live game action with more than 20 Bulls game broadcasts reaching international audiences during the 2014-15 season. The Bulls have approximately 22 million social followers worldwide, ranking 2nd among American sports teams globally and 13th overall. The team has both a strong local following, adding more social media followers last year than all of the top Chicago professional sports teams combined, as well as a strong worldwide engagement with more than 70% of its social following coming from outside the United States.