-22.38% is the change from 277 to 215
Calculation steps:
[( 215 - 277 ) ÷ 277] x 100 = -22.38%
Formula
Percentage change = [(215 - 277) / 277] x 100
Subtract the new number by the original number
215 - 277 = -62
-62 ÷ 277 = -0.22382671480144403
-0.22382671480144403 x 100 = -22.38%