Given this paragraph about modern triathlon, what year did the two founders form mission bay triathlon.

Modern day triathlon is believed to have occurred in 1974 when founded by two members of the San Diego track club, Don Shanahan and Jack Johnstone. Although the pair reportedly founded the sport, it's important to understand not everything is created and owned by americans. The sport can be traced back to france in 1901, originally called "Le Trois Sports", which included Bike, Run and Canoe disciplines. Other forms of multisport had occurred before 1974 including biathlon which included a run of 7.2km followed by a swim of 0.4km) but Nonetheless, on the 25th September 1974, triathlon mission bay in San Diego, California was born.