-69.52% is the change from 830 to 253
Calculation steps:
[( 253 - 830 ) ÷ 830] x 100 = -69.52%
Formula
Percentage change = [(253 - 830) / 830] x 100
Subtract the new number by the original number
253 - 830 = -577
-577 ÷ 830 = -0.6951807228915663
-0.6951807228915663 x 100 = -69.52%