-58.49% is the change from 518 to 215
Calculation steps:
[( 215 - 518 ) ÷ 518] x 100 = -58.49%
Formula
Percentage change = [(215 - 518) / 518] x 100
Subtract the new number by the original number
215 - 518 = -303
-303 ÷ 518 = -0.584942084942085
-0.584942084942085 x 100 = -58.49%