How many people live in extreme poverty in the Caribbean?

One of the intriguing aspects of working on a movement to end extreme poverty is that we should be able to quantify the progress. It should be possible to come up with a good estimate of the number of people living in extreme poverty in the Caribbean and track changes to it. The World Bank puts out detailed poverty estimates for each country. At least the Dominican Republic has a detailed poverty census that lists how many people are living in houses without paved floors and other indicators. What if we pulled all of this data together, validated with local surveys, and came up with a good estimate for the number of extremely poor people? This could be a banner on our website. We could then try to track changes to this number--estimating the number of people helped in different areas by the different programs and those hurt by changes (storms, bank failures, etc.). We could then show the world the magnitude of the problem, but more importantly the progress that we are making. Does anyone want to help come up with the first estimate?