Exactly. People think theres some kind of secret CIA/FBI/NSA or what other entity they want to blame.

The fact is oil is the nation's major export which fuels their economy. Oil prices per barrel have been dropping yearly, with the exception of a few times. 

Venezuela is a socialist country, so many of their public programs come from oil. Lower oil prices means less money to pay for services therefore inflated money. This start well before 2017, the country has been going down the drain.