What is the MAD?

Demand for patient surgery at Washington General Hospital has increased steadily in the past few years, as seen in the following table:

YEAR	OUTPATIENT SURGERIES PERFORMED
1	45
2	50
3	52
4	56
5	58
6	—

The director of medical services predicted six years ago that demand in year 1 would be 42 surgeries. Using exponential smoothing with a weight of a=0.20, develop forecasts for years 2 through 6. What is the MAD?