-74.34% is the change from 830 to 213
Calculation steps:
[( 213 - 830 ) ÷ 830] x 100 = -74.34%
Formula
Percentage change = [(213 - 830) / 830] x 100
Subtract the new number by the original number
213 - 830 = -617
-617 ÷ 830 = -0.7433734939759036
-0.7433734939759036 x 100 = -74.34%