-18.36% is the change from 621 to 507
Calculation steps:
[( 507 - 621 ) ÷ 621] x 100 = -18.36%
Formula
Percentage change = [(507 - 621) / 621] x 100
Subtract the new number by the original number
507 - 621 = -114
-114 ÷ 621 = -0.18357487922705315
-0.18357487922705315 x 100 = -18.36%