Diaspora growth

I put this together myself from data publicly available here: http://factfinder.census.gov/

Follow this link for background on the history of Puerto Rican migration:
http://centropr.hunter.cuny.edu/sites/default/files/past_events/Jorge_Duany_Puerto_Rican_Diaspora.pdf

This quote stood out for me: Almost 8 per cent of the Island’s inhabitants relocated to the US mainland during the 1990s. Between the years 2000 and 2007, even more Puerto Ricans (some 415,000) emigrated than in the previous decade (326,000). More than two million people have moved from the Island to the US mainland since the mid-twentieth century. The proportions of this exodus are even more staggering when one recalls that Puerto Rico’s population had not reached four million in the year 2007. Aside from nineteenth-century Ireland and twentieth-century Suriname, the magnitude of the Puerto Rican diaspora has few historical precedents or contemporary parallels.