-73.68% is the change from 171 to 45
Calculation steps:
[( 45 - 171 ) ÷ 171] x 100 = -73.68%
Formula
Percentage change = [(45 - 171) / 171] x 100
Subtract the new number by the original number
45 - 171 = -126
-126 ÷ 171 = -0.7368421052631579
-0.7368421052631579 x 100 = -73.68%