-67.37% is the change from 521 to 170
Calculation steps:
[( 170 - 521 ) ÷ 521] x 100 = -67.37%
Formula
Percentage change = [(170 - 521) / 521] x 100
Subtract the new number by the original number
170 - 521 = -351
-351 ÷ 521 = -0.6737044145873321
-0.6737044145873321 x 100 = -67.37%