-41.01% is the change from 517 to 305
Calculation steps:
[( 305 - 517 ) ÷ 517] x 100 = -41.01%
Formula
Percentage change = [(305 - 517) / 517] x 100
Subtract the new number by the original number
305 - 517 = -212
-212 ÷ 517 = -0.41005802707930367
-0.41005802707930367 x 100 = -41.01%