New Haven has a history of professional sports franchises dating back to the 19th century and has been the home to professional baseball, basketball, football, hockey, and soccer teams—including the New York Giants of the National Football League from 1973 to 1974, who played at the Yale Bowl. Throughout the second half of the 20th century, New Haven consistently had minor league hockey and baseball teams, which played at the New Haven Arena (built in 1926, demolished in 1972), New Haven Coliseum (1972–2002), and Yale Field (1928–present).

Answer this question, if possible (if impossible, reply "unanswerable"): In what year was Yale field established in New Haven?
1928