"Order Completion Rate" decreasing constantly


I just want to know why my “Order Completion Rate” decreasing constantly? I had cancelled one order at 18 MAY, 2018. And a couple of days ago, my “Order Completion Rate” was 89%. After that, i never cancel any order. Even i have completed 1 order when “Order Completion Rate” was 89%. But my “Order Completion Rate” going down constantly now it’s showing 87%. Could you please let me know why it’s happening to me?


Welcome to the new fiverr…lol