WINNIPEG – The Canadian dollar took a step back to end the week. The loonie closed at US$0.7337 or US$1=C$1.3630, down from US$0.7363 or US$1=C$1.3582 on Thursday. The United States Dollar Index gained 0.20 of a point at 104.98. Crude oil prices were slightly higher on Friday, while the Keystone pipeline will attempt a partial