The sales, S, of a product have declines in recent years. 1.7 million were sold in 2010 but only 1.1 million sold in 2012. Assume the sales are decreasing according to the exponential decay model, S(t)=S₀e^kt.

Find the value k and make an exponential function that describes the number sold after time, t, in years since 2010. Round k to 3 decimal places.