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

The first modern swim/bike/run event was held at Mission Bay, San Diego, California on September 25, 1974.[14] The race was conceived and directed by two members of the San Diego Track Club, Jack Johnstone and Don Shanahan.[15] Johnstone recalls that he was a part of the 70s jogging craze in America and that after entering a few races he was not regaining his "mediocre fitness" despite having been a member of the 1957 Collegiate and AAU All-American swim teams.[16] Then in 1973, Johnstone learned of the Dave Pain Birthday Biathlon, a 7.2 km (4.5 mi) run followed by what was billed as a quarter-mile (0.4 km) swim (the actual distance was only between 200 and 300 yards). The following year, after competing in the event for the second time and placing in the top ten, Johnstone desired more of this style of race and with equal emphasis on the swim. So he petitioned the chairman of the San Diego Track Club who told him he would add a race to the club calendar. But the rest of the race was up to Johnstone to organise, and at the same time he was to contact Don Shanahan so there wouldn't be too many "weird" races on the club schedule. Shanahan told Johnstone that he wanted to include a biking leg to the race; whilst hesitant Johnstone agreed to the addition. When naming the event the pair used the unofficially agreed naming system for multisport events, already used for pentathlon, heptathlon, and decathlon. So they used the Greek prefix tri (three) for the number of events, followed by the already familiar athlon, hence naming the event the Mission Bay Triathlon.[17] It is worthy of note that neither founder had heard of the French events; both believed their race was a unique idea.[18]

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.