-18.46% is the change from 661 to 539
Calculation steps:
[( 539 - 661 ) ÷ 661] x 100 = -18.46%
Formula
Percentage change = [(539 - 661) / 661] x 100
Subtract the new number by the original number
539 - 661 = -122
-122 ÷ 661 = -0.18456883509833585
-0.18456883509833585 x 100 = -18.46%