-50.06% is the change from 813 to 406
Calculation steps:
[( 406 - 813 ) ÷ 813] x 100 = -50.06%
Formula
Percentage change = [(406 - 813) / 813] x 100
Subtract the new number by the original number
406 - 813 = -407
-407 ÷ 813 = -0.5006150061500615
-0.5006150061500615 x 100 = -50.06%