###Process notes
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I started with original data set, but that seemed too small for a scatterplot, and I wanted to find a dataset for which I had pre-1999 values; specifically, I wanted the data to cover some pre-NAFTA years. I did track down that data. The earliest year available was 1989, which is fine, since NAFTA took effect in 1994. The new data set also included 2014, whereas the original set only went as far as 2013. Whee!
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As part of my data cleaning, I took out all countries from which US did not import chocolate in 1989, and set the minimum value of the chocolate import per country at 1 million — this allowed me to take out all countries that had a "0" in their 1989 column. (Not sure at which point values were rounded down to zero; the metadata mentioned a different reason for the zeros anyway.)
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Because of the large number of countries in the original list, I opted to go without the "rest of world" entry that was in the original dataset. Should I have soldiered on and found the average