-76.44% is the change from 815 to 192
Calculation steps:
[( 192 - 815 ) ÷ 815] x 100 = -76.44%
Formula
Percentage change = [(192 - 815) / 815] x 100
Subtract the new number by the original number
192 - 815 = -623
-623 ÷ 815 = -0.7644171779141105
-0.7644171779141105 x 100 = -76.44%