-75.05% is the change from 509 to 127
Calculation steps:
[( 127 - 509 ) ÷ 509] x 100 = -75.05%
Formula
Percentage change = [(127 - 509) / 509] x 100
Subtract the new number by the original number
127 - 509 = -382
-382 ÷ 509 = -0.75049115913556
-0.75049115913556 x 100 = -75.05%