-20.52% is the change from 843 to 670
Calculation steps:
[( 670 - 843 ) ÷ 843] x 100 = -20.52%
Formula
Percentage change = [(670 - 843) / 843] x 100
Subtract the new number by the original number
670 - 843 = -173
-173 ÷ 843 = -0.20521945432977462
-0.20521945432977462 x 100 = -20.52%