-79.3% is the change from 343 to 71
Calculation steps:
[( 71 - 343 ) ÷ 343] x 100 = -79.3%
Formula
Percentage change = [(71 - 343) / 343] x 100
Subtract the new number by the original number
71 - 343 = -272
-272 ÷ 343 = -0.793002915451895
-0.793002915451895 x 100 = -79.3%