-66.92% is the change from 650 to 215
Calculation steps:
[( 215 - 650 ) ÷ 650] x 100 = -66.92%
Formula
Percentage change = [(215 - 650) / 650] x 100
Subtract the new number by the original number
215 - 650 = -435
-435 ÷ 650 = -0.6692307692307692
-0.6692307692307692 x 100 = -66.92%