-73.65% is the change from 630 to 166
Calculation steps:
[( 166 - 630 ) ÷ 630] x 100 = -73.65%
Formula
Percentage change = [(166 - 630) / 630] x 100
Subtract the new number by the original number
166 - 630 = -464
-464 ÷ 630 = -0.7365079365079366
-0.7365079365079366 x 100 = -73.65%