-74.85% is the change from 509 to 128
Calculation steps:
[( 128 - 509 ) ÷ 509] x 100 = -74.85%
Formula
Percentage change = [(128 - 509) / 509] x 100
Subtract the new number by the original number
128 - 509 = -381
-381 ÷ 509 = -0.7485265225933202
-0.7485265225933202 x 100 = -74.85%