In a surprising development given Cuba’s worsening economy, exports of food and other goods from the United States were up last year thanks to an explosion of trade involving private small and medium enterprises on the island. According to trade data gathered by the New York-based U.S. Cuba-Trade and Economic Council, an organization that tracks business with Cuba, U.S. companies, many based in Miami and Hialeah, exported food and agricultural products worth $342.6 million. That’s a 12.4% increase from 2021, when private enterprises, known in Cuba as pymes, were first authorized, and exports t…