In 2014 there were mass protests against the government, in reality it was an attempt to overthrow the government, which was responded to with brutality. That brutality was met with sanctions. Today their GDP/capita is about $5000. That's obviously going to be explained in part by the decline in oil prices around the same time, but not to that degree, to say the least.
* - As an addendum here it's also unclear to me how exactly Wiki is calculating that figure and whether it accounts for, in any way, the substantial scale of emigration from Venezuela. If not, then the relative decline is even larger than it sounds.
[1] - https://en.wikipedia.org/wiki/Crisis_in_Venezuela#/media/Fil...