Happy Planet Index misplaces Caribbean islands (and is a less happy report because of it)

I'm not Happy. The recently released 'Happy Planet Index' report placed Costa Rica at the top. In previous years, Dominica also placed highly (In a previous report, 2006 I think, we were the 4th happiest place in the world).

So I eagerly downloaded and perused this year's report. Not one mention of Dominica. And in fact, not a mention of other small Caribbean islands. No Barbados, no Antigua, no Greneda. Not even a Caricom or regional grouping that I could find.

Now we're often overlooked because of our size, but we're still a nation state and a UN member (even if we don't always pay our fees on time). But to omit us (and our neighbours) somewhat misses the point. We satisfy all the criteria for a deliriously 'happy' nation (low ecological footprint, high life expectancy, cheap rum, etc.). It's precisely because we're a small nation that we're so Happy.

In fact, if the Dominican Republic is such a Happy country (#2nd place, no less), how come so many of their nationals migrate to Dominica (by whatever means necessary)?