-74.34% is the change from 838 to 215
Calculation steps:
[( 215 - 838 ) ÷ 838] x 100 = -74.34%
Formula
Percentage change = [(215 - 838) / 838] x 100
Subtract the new number by the original number
215 - 838 = -623
-623 ÷ 838 = -0.7434367541766109
-0.7434367541766109 x 100 = -74.34%