-21.86% is the change from 851 to 665
Calculation steps:
[( 665 - 851 ) ÷ 851] x 100 = -21.86%
Formula
Percentage change = [(665 - 851) / 851] x 100
Subtract the new number by the original number
665 - 851 = -186
-186 ÷ 851 = -0.21856639247943596
-0.21856639247943596 x 100 = -21.86%