31.01% is the change from 661 to 866
Calculation steps:
[( 866 - 661 ) ÷ 661] x 100 = 31.01%
Formula
Percentage change = [(866 - 661) / 661] x 100
Subtract the new number by the original number
866 - 661 = 205
205 ÷ 661 = 0.3101361573373676
0.3101361573373676 x 100 = 31.01%