-79.52% is the change from 83 to 17
Calculation steps:
[( 17 - 83 ) ÷ 83] x 100 = -79.52%
Formula
Percentage change = [(17 - 83) / 83] x 100
Subtract the new number by the original number
17 - 83 = -66
-66 ÷ 83 = -0.7951807228915663
-0.7951807228915663 x 100 = -79.52%