-57.06% is the change from 666 to 286
Calculation steps:
[( 286 - 666 ) ÷ 666] x 100 = -57.06%
Formula
Percentage change = [(286 - 666) / 666] x 100
Subtract the new number by the original number
286 - 666 = -380
-380 ÷ 666 = -0.5705705705705706
-0.5705705705705706 x 100 = -57.06%