-51% is the change from 851 to 417
Calculation steps:
[( 417 - 851 ) ÷ 851] x 100 = -51%
Formula
Percentage change = [(417 - 851) / 851] x 100
Subtract the new number by the original number
417 - 851 = -434
-434 ÷ 851 = -0.5099882491186839
-0.5099882491186839 x 100 = -51%