-73.73% is the change from 830 to 218
Calculation steps:
[( 218 - 830 ) ÷ 830] x 100 = -73.73%
Formula
Percentage change = [(218 - 830) / 830] x 100
Subtract the new number by the original number
218 - 830 = -612
-612 ÷ 830 = -0.7373493975903614
-0.7373493975903614 x 100 = -73.73%