-67.75% is the change from 307 to 99
Calculation steps:
[( 99 - 307 ) ÷ 307] x 100 = -67.75%
Formula
Percentage change = [(99 - 307) / 307] x 100
Subtract the new number by the original number
99 - 307 = -208
-208 ÷ 307 = -0.6775244299674267
-0.6775244299674267 x 100 = -67.75%