-26.93% is the change from 687 to 502
Calculation steps:
[( 502 - 687 ) ÷ 687] x 100 = -26.93%
Formula
Percentage change = [(502 - 687) / 687] x 100
Subtract the new number by the original number
502 - 687 = -185
-185 ÷ 687 = -0.2692867540029112
-0.2692867540029112 x 100 = -26.93%