-51.07% is the change from 513 to 251
Calculation steps:
[( 251 - 513 ) ÷ 513] x 100 = -51.07%
Formula
Percentage change = [(251 - 513) / 513] x 100
Subtract the new number by the original number
251 - 513 = -262
-262 ÷ 513 = -0.5107212475633528
-0.5107212475633528 x 100 = -51.07%