Between 1959 and 1962 approximately 200,000 Cubans, primarily professionals and affluent landowners, fled the country.
Many of the affluent population fled the country after 1959. 
mnli hypothesis: Many of the affluent population fled the country after 1959.  premise: Between 1959 and 1962 approximately 200,000 Cubans, primarily professionals and affluent landowners, fled the country.