By the end of 2016, Maine overdose deaths totaled 378, and the black and green lines were a lot steeper. The black line was off the chart (literally).
Also note that overdose deaths from prescription (legal) narcotics have actually been stable, and fallen a little, since 2002. Legal drugs are not a factor in the staggering increase of deaths. While the use of legal narcotics definitely needs to be minimized, and while legal narcotics continue to be diverted and used illegally, the epidemic of opioid deaths is due to Afghan heroin and (probably Chinese) fentanyl, which are not being prevented from entering the US.