-92.15% is the change from 191 to 15
Calculation steps:
[( 15 - 191 ) ÷ 191] x 100 = -92.15%
Formula
Percentage change = [(15 - 191) / 191] x 100
Subtract the new number by the original number
15 - 191 = -176
-176 ÷ 191 = -0.9214659685863874
-0.9214659685863874 x 100 = -92.15%