Yes, our tax dollars went into holding those four "polls", with the fifth one coming next month at a cost of $2 Millions to U.S taxpayers, so I know what they are.
What these plebiscites DO show are the reflection of the Puerto Rican people in regards to their identity, as well as the relation they want to have with the United States, and it always follow this trajectory, without fail:
1) The better the Puerto Rican economy is doing, the less Puerto Ricans want to be an U.S State. Back in the 90s when life is good on the island, about 1/3 of the population wants to remain with the status quo as an autonomous U.S territory, plus another 1/3 who actually demands to have their own independent country outright. No American federal taxes, yay! We can do it our own way!
2) The worse the Puerto Rican economy is doing, the more Puerto Ricans wants to become a U.S State. As their national debts are mounting, the jobs are going elsewhere, and the taxes kept increasing, the number of voters favoring Statehood shot up to over 40% in 2012.
Now that their island is officially bankrupt and their economy ran to the ground by their own people, I have ZERO doubt that Puerto Rico will vote overwhelmingly for Statehood in 2017, hoping to leech more "free money from other States" like their politicians are advetising, and I hope Congress will tell them to take that rotten attitude and scram.
This Union doesn't need a 51st State with a population that just want to tag along for the ride and "contribute" their deadweight when it suits them.