-77.84% is the change from 970 to 215
Calculation steps:
[( 215 - 970 ) ÷ 970] x 100 = -77.84%
Formula
Percentage change = [(215 - 970) / 970] x 100
Subtract the new number by the original number
215 - 970 = -755
-755 ÷ 970 = -0.7783505154639175
-0.7783505154639175 x 100 = -77.84%