YoY cards cards where Year to date is the range set for the card do not calculate prior year totals and hence yoy changes correctly until the month is complete. Since a year is assumed as 365 days for YOY cards, the leap year throws off the comparison to prior years until the month is complete. We are relying on mid month stats very heavily, so having correct comparative numbers is crucial. A fix for Leap years needs to be developed to overcome this issue. Please up vote this.