-16.94% is the change from 661 to 549
Calculation steps:
[( 549 - 661 ) ÷ 661] x 100 = -16.94%
Formula
Percentage change = [(549 - 661) / 661] x 100
Subtract the new number by the original number
549 - 661 = -112
-112 ÷ 661 = -0.16944024205748864
-0.16944024205748864 x 100 = -16.94%