-31.54% is the change from 501 to 343
Calculation steps:
[( 343 - 501 ) ÷ 501] x 100 = -31.54%
Formula
Percentage change = [(343 - 501) / 501] x 100
Subtract the new number by the original number
343 - 501 = -158
-158 ÷ 501 = -0.3153692614770459
-0.3153692614770459 x 100 = -31.54%