An operation analyst is forecasting this year's demand for one of his company's products based on the following historical data: (4 year ago Quantity sold was 10906), (3 year ago Quantity sold was 12401 ), (2 year ago Quantity sold was 18120 ) and the last year Quantity sold was 19198 . The previous trend line had predicted 12250 for three years ago, 13000 for two years ago and 13750 for last year. What was the mean absolute percent error (MAPE) for these forecasts?