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 $1022),(3$ year ago Quantity sold was $1223),(2$ year ago Quantity sold was $1701)$ and the last year Quantity sold was $1902.$ The previous trend line had predicted $1206$ for three years ago, $1262$ for two years ago and $1318$ for last year. What was the mean squared error $($MSE$)$ for these forecasts?