-91.45% is the change from 830 to 71
Calculation steps:
[( 71 - 830 ) ÷ 830] x 100 = -91.45%
Formula
Percentage change = [(71 - 830) / 830] x 100
Subtract the new number by the original number
71 - 830 = -759
-759 ÷ 830 = -0.9144578313253012
-0.9144578313253012 x 100 = -91.45%