As I write this, one dollar fetches about 191,000 bolivars, according to the black market exchange rate that everyone uses. (Nobody trusts the overvalued official rate because the government has lost credibility among ordinary Venezuelans and in international markets that determine exchange rates.)
A year ago, one dollar fetched 3,100 bolivars. The bolivar has lost 98% of its value since then. Even on the day I reported this story, January 11, a dollar would have gotten me about 151,000 bolivars in the morning.
http://money.cnn.com/2018/01/17/news/economy/venezuela-cash-crisis/index.html