-71.14% is the change from 343 to 99
Calculation steps:
[( 99 - 343 ) ÷ 343] x 100 = -71.14%
Formula
Percentage change = [(99 - 343) / 343] x 100
Subtract the new number by the original number
99 - 343 = -244
-244 ÷ 343 = -0.7113702623906706
-0.7113702623906706 x 100 = -71.14%