-18.33% is the change from 813 to 664
Calculation steps:
[( 664 - 813 ) ÷ 813] x 100 = -18.33%
Formula
Percentage change = [(664 - 813) / 813] x 100
Subtract the new number by the original number
664 - 813 = -149
-149 ÷ 813 = -0.18327183271832717
-0.18327183271832717 x 100 = -18.33%