-31.95% is the change from 507 to 345
Calculation steps:
[( 345 - 507 ) ÷ 507] x 100 = -31.95%
Formula
Percentage change = [(345 - 507) / 507] x 100
Subtract the new number by the original number
345 - 507 = -162
-162 ÷ 507 = -0.31952662721893493
-0.31952662721893493 x 100 = -31.95%