-23.97% is the change from 851 to 647
Calculation steps:
[( 647 - 851 ) ÷ 851] x 100 = -23.97%
Formula
Percentage change = [(647 - 851) / 851] x 100
Subtract the new number by the original number
647 - 851 = -204
-204 ÷ 851 = -0.23971797884841364
-0.23971797884841364 x 100 = -23.97%