-74.22% is the change from 644 to 166
Calculation steps:
[( 166 - 644 ) ÷ 644] x 100 = -74.22%
Formula
Percentage change = [(166 - 644) / 644] x 100
Subtract the new number by the original number
166 - 644 = -478
-478 ÷ 644 = -0.7422360248447205
-0.7422360248447205 x 100 = -74.22%