-79.61% is the change from 814 to 166
Calculation steps:
[( 166 - 814 ) ÷ 814] x 100 = -79.61%
Formula
Percentage change = [(166 - 814) / 814] x 100
Subtract the new number by the original number
166 - 814 = -648
-648 ÷ 814 = -0.7960687960687961
-0.7960687960687961 x 100 = -79.61%