-63.92% is the change from 851 to 307
Calculation steps:
[( 307 - 851 ) ÷ 851] x 100 = -63.92%
Formula
Percentage change = [(307 - 851) / 851] x 100
Subtract the new number by the original number
307 - 851 = -544
-544 ÷ 851 = -0.6392479435957696
-0.6392479435957696 x 100 = -63.92%