-37.13% is the change from 342 to 215
Calculation steps:
[( 215 - 342 ) ÷ 342] x 100 = -37.13%
Formula
Percentage change = [(215 - 342) / 342] x 100
Subtract the new number by the original number
215 - 342 = -127
-127 ÷ 342 = -0.3713450292397661
-0.3713450292397661 x 100 = -37.13%