For comparison Puerto Rico have had about 10k murders in the last 15 years alone[1], and that's in less than half the Cuban population.
From 1998 figures[2] and 2002 population numbers I guesstimate that officially about 820 murders occur per year in Cuba, and the 10k in 50 years evens out to 200 per year.
[1] http://www.estadisticas.pr/iepr/LinkClick.aspx?fileticket=nf...
[2] http://www.sld.cu/sitios/dne/buscar.php?id=3297&iduser=4&id_...