-39.93% is the change from 566 to 340
Calculation steps:
[( 340 - 566 ) ÷ 566] x 100 = -39.93%
Formula
Percentage change = [(340 - 566) / 566] x 100
Subtract the new number by the original number
340 - 566 = -226
-226 ÷ 566 = -0.3992932862190813
-0.3992932862190813 x 100 = -39.93%