Since the early days of the Cuban Revolution in the 1960s, groups of foreigners have visited Cuba to observe the social accomplishments of the Revolution such as the health care system, or participate in supposed acts of solidarity like cutting sugarcane. During the 1970s and '80s, revolutionary tourism was a common form of travel to the island. In the '90s, the country's economic crisis has forced Cuba to aggressively develop the conventional tourism market, and eroded many of the showcase gains of the Revolution, thus reducing the influx and presence of revolutionary tourists. The Cuban government continues to sponsor conferences to attract tourists who still support the goals of the Revolution.