-99.76% is the change from 830 to 2
Calculation steps:
[( 2 - 830 ) ÷ 830] x 100 = -99.76%
Formula
Percentage change = [(2 - 830) / 830] x 100
Subtract the new number by the original number
2 - 830 = -828
-828 ÷ 830 = -0.9975903614457832
-0.9975903614457832 x 100 = -99.76%