Task: Question Generation
Input (English): The Cubs' current spring training facility is located in Sloan Park in |Mesa, Arizona, where they play in the Cactus League. The park seats 15,000, making it Major League baseball's largest spring training facility by capacity. The Cubs annually sell out most of their games both at home and on the road. Before Sloan Park opened in 2014, the team played games at HoHoKam Park - Dwight Patterson Field from 1979. "HoHoKam" is literally translated from Native American as "those who vanished." The North Siders have called Mesa their spring home for most seasons since 1952.
Output (English): When did Sloan Park open?