-39.07% is the change from 343 to 209
Calculation steps:
[( 209 - 343 ) ÷ 343] x 100 = -39.07%
Formula
Percentage change = [(209 - 343) / 343] x 100
Subtract the new number by the original number
209 - 343 = -134
-134 ÷ 343 = -0.39067055393586003
-0.39067055393586003 x 100 = -39.07%