Question: When did wall street journal prime rate change?
Disambiguated questions and answers: question: When did wall street journal prime rate change during 2017?
When did wall street journal prime rate change during 2016?
When did wall street journal prime rate change during 2015?
answer: 16-Mar-17, 15-Jun-17, and 14-Dec-17
15-Dec-16
17-Dec-15
Natural Questions answer: 15 - Jun - 17 (from the Wikipedia article "Wall Street Journal prime rate")