-61.27% is the change from 661 to 256
Calculation steps:
[( 256 - 661 ) ÷ 661] x 100 = -61.27%
Formula
Percentage change = [(256 - 661) / 661] x 100
Subtract the new number by the original number
256 - 661 = -405
-405 ÷ 661 = -0.6127080181543116
-0.6127080181543116 x 100 = -61.27%