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Yea that graph is a little difficult to read. It took me a minute but in a nutshell this is what I got from it.

The bottom line appears to show increase in deaths over time.

The side line represents total drug deaths. (ie. ~26-27 deaths per 100,000 people)

Since this is a comparison among multiple drugs there is a third parameter. The thickness of each colored line representing drug class. This shows the number (percentage %) of the total. The thickest line represents the most deaths. (ie. Pharmaceuticals by way of unintentional self harm) The thin grey Other* line at the top that is nearly invisible over time in comparison because it shows the least amount of deaths. (ie. Cannabis, LSD, Opium, Mescaline, Mushrooms and all cases of overdose by assault).

In my mind the chart should have had Other on the bottom and Pills at the top? Not my chart though.

Hope I got this right and this helps some of you. :)