-66.61% is the change from 644 to 215
Calculation steps:
[( 215 - 644 ) ÷ 644] x 100 = -66.61%
Formula
Percentage change = [(215 - 644) / 644] x 100
Subtract the new number by the original number
215 - 644 = -429
-429 ÷ 644 = -0.6661490683229814
-0.6661490683229814 x 100 = -66.61%