-34.71% is the change from 507 to 331
Calculation steps:
[( 331 - 507 ) ÷ 507] x 100 = -34.71%
Formula
Percentage change = [(331 - 507) / 507] x 100
Subtract the new number by the original number
331 - 507 = -176
-176 ÷ 507 = -0.34714003944773175
-0.34714003944773175 x 100 = -34.71%