Spent last week on the island for a business trip and finally got out of San Juan on Saturday. Left me quite curious about the state of their economy and such.
Any answer to this question will break the 20-year rule, since it necessitates discussing Puerto Rico's current economic situation. I recommend /r/AskSocialScience for answers.
in 1994, Puerto Rico's GDP per capita (in current USD) was $10,876, according to World Bank data. That was 39% of the US GDP per capita ($27,776), but it was comparable to South Korea ($10,275), Greece ($10,536), and Cyprus ($11,618) and the highest of all Latin American countries, the next highest being Argentina ($9,066). Furthermore, in 1994, 88 of Puerto Rico's GDP was in industry, 10% in services, and 1% in agriculture. The growth rate for 1994 was 4%. This information shows that, for the most recent period that can be discussed here, Puerto Rico was a developing, industrial, middle-income economy.