The number of knee surgeries performed at New Albany Surgical Hospitals (NASH) has increased steadily over the past five years. The hospital's administration is seeking the best method to forecast the demand for such surgeries in years 6 through 9. The data for the past five years are shown below.

NASH's administration is considering alternative exponential forecasting methods. Use the first three years to initialize your methods. All methods must be tested and compared using the same years. Use the bias and MAD as the performance criteria to determine the best knee surgery forecasting method for periods 6 through 9.

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YEAR DEMAND 350 429 642 765