-22.33% is the change from 851 to 661
Calculation steps:
[( 661 - 851 ) ÷ 851] x 100 = -22.33%
Formula
Percentage change = [(661 - 851) / 851] x 100
Subtract the new number by the original number
661 - 851 = -190
-190 ÷ 851 = -0.22326674500587543
-0.22326674500587543 x 100 = -22.33%