-59.15% is the change from 661 to 270
Calculation steps:
[( 270 - 661 ) ÷ 661] x 100 = -59.15%
Formula
Percentage change = [(270 - 661) / 661] x 100
Subtract the new number by the original number
270 - 661 = -391
-391 ÷ 661 = -0.5915279878971256
-0.5915279878971256 x 100 = -59.15%