-99.18% is the change from 851 to 7
Calculation steps:
[( 7 - 851 ) ÷ 851] x 100 = -99.18%
Formula
Percentage change = [(7 - 851) / 851] x 100
Subtract the new number by the original number
7 - 851 = -844
-844 ÷ 851 = -0.9917743830787309
-0.9917743830787309 x 100 = -99.18%