2019. Venezuela already had a decade of severe decline before that. Things got bad way before sanctions. 

https://en.wikipedia.org/wiki/History_of_Venezuela

Economic conditions continued to deteriorate in 2016 when consumer prices rose 800% and the gross domestic product contracted by 18.6%,[^[39]](https://en.wikipedia.org/wiki/History_of_Venezuela#cite_note-39) causing hunger to escalate to the point that the “Venezuela’s Living Conditions Survey” (ENCOVI) found nearly 75 percent of the population had lost an average of at least 19 pounds in 2016 due to a lack of proper nutrition.[^[40]](https://en.wikipedia.org/wiki/History_of_Venezuela#cite_note-40) Luis Almagro, secretary general of the Organization of American States(OAS) stated, “I have never seen a country going down so fast, at every level: politically, economically, socially”.

On 1 May 2017 following a month of protests that resulted in at least 29 dead, Maduro called for a Constituent Assembly that would draft a new constitution that would replace the 1999 Venezuela Constitution.[^[42]](https://en.wikipedia.org/wiki/History_of_Venezuela#cite_note-USAmay-42) He invoked Article 347, and stated that his call for a new constitution was necessary to counter the actions of the opposition. The members of the Constituent Assembly were not to be elected in open elections, but selected from social organizations loyal to Maduro.[^[42]](https://en.wikipedia.org/wiki/History_of_Venezuela#cite_note-USAmay-42) It would also allow him to stay in power during the interregnum and skip the 2018 presidential elections, as the process would take at least two years