-23.03% is the change from 838 to 645
Calculation steps:
[( 645 - 838 ) ÷ 838] x 100 = -23.03%
Formula
Percentage change = [(645 - 838) / 838] x 100
Subtract the new number by the original number
645 - 838 = -193
-193 ÷ 838 = -0.23031026252983294
-0.23031026252983294 x 100 = -23.03%