Here's one from 2014. https://www.samhsa.gov/data/sites/default/files/NSDUH-DetTabs2014/NSDUH-DetTabs2014.htm#tab6-47b https://www.samhsa.gov/data/sites/default

Here's one from 2014. https://www.samhsa.gov/data/sites/default/files/NSDUH-DetTabs2014/NSDUH-DetTabs2014.htm#tab6-47b https://www.samhsa.gov/data/sites/default/files/NSDUH-DetTab... I think I've linked to the right table, but just in case it's "Table 6.47B – Source Where Pain Relievers Were Obtained for Most Recent Nonmedical Use among Past Year Users Aged 12 or Older, by Age Group: Percentages, Annual Averages Based on 2011-2012 and 2013-2014", but there's a lot of information in this link.