-74.22% is the change from 830 to 214
Calculation steps:
[( 214 - 830 ) ÷ 830] x 100 = -74.22%
Formula
Percentage change = [(214 - 830) / 830] x 100
Subtract the new number by the original number
214 - 830 = -616
-616 ÷ 830 = -0.7421686746987952
-0.7421686746987952 x 100 = -74.22%