-84.86% is the change from 601 to 91
Calculation steps:
[( 91 - 601 ) ÷ 601] x 100 = -84.86%
Formula
Percentage change = [(91 - 601) / 601] x 100
Subtract the new number by the original number
91 - 601 = -510
-510 ÷ 601 = -0.848585690515807
-0.848585690515807 x 100 = -84.86%