-73.98% is the change from 830 to 216
Calculation steps:
[( 216 - 830 ) ÷ 830] x 100 = -73.98%
Formula
Percentage change = [(216 - 830) / 830] x 100
Subtract the new number by the original number
216 - 830 = -614
-614 ÷ 830 = -0.7397590361445783
-0.7397590361445783 x 100 = -73.98%