-80.04% is the change from 511 to 102
Calculation steps:
[( 102 - 511 ) ÷ 511] x 100 = -80.04%
Formula
Percentage change = [(102 - 511) / 511] x 100
Subtract the new number by the original number
102 - 511 = -409
-409 ÷ 511 = -0.8003913894324853
-0.8003913894324853 x 100 = -80.04%