-73.57% is the change from 647 to 171
Calculation steps:
[( 171 - 647 ) ÷ 647] x 100 = -73.57%
Formula
Percentage change = [(171 - 647) / 647] x 100
Subtract the new number by the original number
171 - 647 = -476
-476 ÷ 647 = -0.7357032457496137
-0.7357032457496137 x 100 = -73.57%