-36.96% is the change from 506 to 319
Calculation steps:
[( 319 - 506 ) ÷ 506] x 100 = -36.96%
Formula
Percentage change = [(319 - 506) / 506] x 100
Subtract the new number by the original number
319 - 506 = -187
-187 ÷ 506 = -0.3695652173913043
-0.3695652173913043 x 100 = -36.96%