-85.53% is the change from 691 to 100
Calculation steps:
[( 100 - 691 ) ÷ 691] x 100 = -85.53%
Formula
Percentage change = [(100 - 691) / 691] x 100
Subtract the new number by the original number
100 - 691 = -591
-591 ÷ 691 = -0.8552821997105644
-0.8552821997105644 x 100 = -85.53%