"The USA attracts immigrants from all over the world. Despite the proximity of the two countries, Cubans make up less than 1% of all immigrants coming to the USA, according to the Department of Homeland Security (2009 figures). There are many more Koreans, many more Brazilians, many more Chinese illegals attempting to enter the USA than Cubans."
In fairness:
1. Lots of people come here, so being 1% of that is still sizable to a degree,
2. There are more Chinese and Brazilians to begin with, ergo, more likely immigrants from those areas just by sheer number of the population,
3. http://www.reuters.com/article/2013/07/31/us-cuba-migration-idUSBRE96U1F920130731
"According to Cuba's annual demographic report for 2012 (here), 46,662 Cubans migrated permanently in 2012, the largest annual figure since more than 47,000 left the communist-ruled island in 1994 after what international observers dubbed the "Rafter Crisis."
Over the last five years, Cubans have been emigrating at an average annual rate of more than 39,000, the report said, higher than in any other five-year period since the earliest years of the revolution."
^In context, then, that 1% is more striking.