-91.08% is the change from 830 to 74
Calculation steps:
[( 74 - 830 ) ÷ 830] x 100 = -91.08%
Formula
Percentage change = [(74 - 830) / 830] x 100
Subtract the new number by the original number
74 - 830 = -756
-756 ÷ 830 = -0.9108433734939759
-0.9108433734939759 x 100 = -91.08%