-89.26% is the change from 661 to 71
Calculation steps:
[( 71 - 661 ) ÷ 661] x 100 = -89.26%
Formula
Percentage change = [(71 - 661) / 661] x 100
Subtract the new number by the original number
71 - 661 = -590
-590 ÷ 661 = -0.8925869894099848
-0.8925869894099848 x 100 = -89.26%