-12.71% is the change from 661 to 577
Calculation steps:
[( 577 - 661 ) ÷ 661] x 100 = -12.71%
Formula
Percentage change = [(577 - 661) / 661] x 100
Subtract the new number by the original number
577 - 661 = -84
-84 ÷ 661 = -0.12708018154311648
-0.12708018154311648 x 100 = -12.71%