-74.74% is the change from 851 to 215
Calculation steps:
[( 215 - 851 ) ÷ 851] x 100 = -74.74%
Formula
Percentage change = [(215 - 851) / 851] x 100
Subtract the new number by the original number
215 - 851 = -636
-636 ÷ 851 = -0.7473560517038778
-0.7473560517038778 x 100 = -74.74%