-66.77% is the change from 647 to 215
Calculation steps:
[( 215 - 647 ) ÷ 647] x 100 = -66.77%
Formula
Percentage change = [(215 - 647) / 647] x 100
Subtract the new number by the original number
215 - 647 = -432
-432 ÷ 647 = -0.6676970633693973
-0.6676970633693973 x 100 = -66.77%