-95.49% is the change from 510 to 23
Calculation steps:
[( 23 - 510 ) ÷ 510] x 100 = -95.49%
Formula
Percentage change = [(23 - 510) / 510] x 100
Subtract the new number by the original number
23 - 510 = -487
-487 ÷ 510 = -0.9549019607843138
-0.9549019607843138 x 100 = -95.49%