-73.47% is the change from 343 to 91
Calculation steps:
[( 91 - 343 ) ÷ 343] x 100 = -73.47%
Formula
Percentage change = [(91 - 343) / 343] x 100
Subtract the new number by the original number
91 - 343 = -252
-252 ÷ 343 = -0.7346938775510204
-0.7346938775510204 x 100 = -73.47%