taking the data from here: http://www.nytimes.com/interactive/2015/12/10/us/gun-sales-terrorism-obama-restrictions.html?_r=0
which Curran posted here (thanks!): https://github.com/curran/data/blob/gh-pages/nyt/gun_sales/all-data.csv
looking at the same data, but all the years on one graph instead. Very much a WIP.