-57.17% is the change from 509 to 218
Calculation steps:
[( 218 - 509 ) ÷ 509] x 100 = -57.17%
Formula
Percentage change = [(218 - 509) / 509] x 100
Subtract the new number by the original number
218 - 509 = -291
-291 ÷ 509 = -0.5717092337917485
-0.5717092337917485 x 100 = -57.17%