Since 1941, these stations have been required to maintain an effective radiated power at least 10,000 watts to retain their status. Nearly all these stations in the United States, Canada and The Bahamas broadcast at 50,000 watts, with several clear-channel stations in Mexico going as high as 150,000 watts and XEW in Mexico City operating at 250,000 watts for over 80 years. (Cuba was originally included in the plan and had several stations given clear-channel status, but Cuba stopped participating after the Cuban Revolution of 1959.)