-82.05% is the change from 830 to 149
Calculation steps:
[( 149 - 830 ) ÷ 830] x 100 = -82.05%
Formula
Percentage change = [(149 - 830) / 830] x 100
Subtract the new number by the original number
149 - 830 = -681
-681 ÷ 830 = -0.8204819277108434
-0.8204819277108434 x 100 = -82.05%