-62.78% is the change from 266 to 99
Calculation steps:
[( 99 - 266 ) ÷ 266] x 100 = -62.78%
Formula
Percentage change = [(99 - 266) / 266] x 100
Subtract the new number by the original number
99 - 266 = -167
-167 ÷ 266 = -0.6278195488721805
-0.6278195488721805 x 100 = -62.78%