-18.76% is the change from 645 to 524
Calculation steps:
[( 524 - 645 ) ÷ 645] x 100 = -18.76%
Formula
Percentage change = [(524 - 645) / 645] x 100
Subtract the new number by the original number
524 - 645 = -121
-121 ÷ 645 = -0.1875968992248062
-0.1875968992248062 x 100 = -18.76%