Question: When did wall street journal prime rate change?
qaPairs: question: When did wall street journal prime rate change during 2017?
answer: 16-Mar-17, 15-Jun-17, and 14-Dec-17
question: When did wall street journal prime rate change during 2016?
answer: 15-Dec-16
question: When did wall street journal prime rate change during 2015?
answer: 17-Dec-15