-67.32% is the change from 664 to 217
Calculation steps:
[( 217 - 664 ) ÷ 664] x 100 = -67.32%
Formula
Percentage change = [(217 - 664) / 664] x 100
Subtract the new number by the original number
217 - 664 = -447
-447 ÷ 664 = -0.6731927710843374
-0.6731927710843374 x 100 = -67.32%