Need a formula to calculate the average daily change as a new day is posted.
For example:
Day 1: E2 = 230, beginning value
Day 2: E3 = 224, change is 6, average change is 6
Day 3: E4 = 216, change is 8, average change is 7
Day 4: E5 = 216, change is 0, average change is 4.7
Day 5: E6 = 215...