Why might the Bank of Canada decide to keep the overnight loans rate at 1 percent in 2018?

In September 2015, the unemployment rate was 7.0 percent, the inflation rate was 0.1 percent, and the overnight loans rate target was 0.5 percent. In September 2017, the unemployment rate was 6.2 percent, the inflation rate was 1.4 percent, and the overnight loans rate target was 1.0 percent.