WINNIPEG – The Canadian dollar took a tumble on Tuesday. The loonie closed at US$0.7290 or US$1=C$1.3717, down from US$0.7345 or US$1=C$1.3615 on Monday. The Bank of Canada (BoC) will announce on Wednesday whether or not it will raise its key interest rate. The United States Dollar Index jumped 1.27 points at 105.62. Crude oil