-51.14% is the change from 526 to 257
Calculation steps:
[( 257 - 526 ) ÷ 526] x 100 = -51.14%
Formula
Percentage change = [(257 - 526) / 526] x 100
Subtract the new number by the original number
257 - 526 = -269
-269 ÷ 526 = -0.5114068441064639
-0.5114068441064639 x 100 = -51.14%