-49.62% is the change from 391 to 197
Calculation steps:
[( 197 - 391 ) ÷ 391] x 100 = -49.62%
Formula
Percentage change = [(197 - 391) / 391] x 100
Subtract the new number by the original number
197 - 391 = -194
-194 ÷ 391 = -0.4961636828644501
-0.4961636828644501 x 100 = -49.62%