-74.07% is the change from 829 to 215
Calculation steps:
[( 215 - 829 ) ÷ 829] x 100 = -74.07%
Formula
Percentage change = [(215 - 829) / 829] x 100
Subtract the new number by the original number
215 - 829 = -614
-614 ÷ 829 = -0.7406513872135102
-0.7406513872135102 x 100 = -74.07%