-33.6% is the change from 506 to 336
Calculation steps:
[( 336 - 506 ) ÷ 506] x 100 = -33.6%
Formula
Percentage change = [(336 - 506) / 506] x 100
Subtract the new number by the original number
336 - 506 = -170
-170 ÷ 506 = -0.3359683794466403
-0.3359683794466403 x 100 = -33.6%