-10.5% is the change from 343 to 307
Calculation steps:
[( 307 - 343 ) ÷ 343] x 100 = -10.5%
Formula
Percentage change = [(307 - 343) / 343] x 100
Subtract the new number by the original number
307 - 343 = -36
-36 ÷ 343 = -0.10495626822157435
-0.10495626822157435 x 100 = -10.5%