-17.16% is the change from 612 to 507
Calculation steps:
[( 507 - 612 ) ÷ 612] x 100 = -17.16%
Formula
Percentage change = [(507 - 612) / 612] x 100
Subtract the new number by the original number
507 - 612 = -105
-105 ÷ 612 = -0.1715686274509804
-0.1715686274509804 x 100 = -17.16%