-35.35% is the change from 215 to 139
Calculation steps:
[( 139 - 215 ) ÷ 215] x 100 = -35.35%
Formula
Percentage change = [(139 - 215) / 215] x 100
Subtract the new number by the original number
139 - 215 = -76
-76 ÷ 215 = -0.35348837209302325
-0.35348837209302325 x 100 = -35.35%