The table below shows forecasts for Sales ($m) for the four time periods using a forecasting technique F₁

Year	Sales ($m)	F1 ($m)
2011	1.9	2.9
2012	2.9	3.5
2013	4.7	4.4
2014	3.7	3.5

Determine the Mean Absolute Deviation, MAD₁ for the forecast F₁ and enter the value in the box below