-66.51% is the change from 645 to 216
Calculation steps:
[( 216 - 645 ) ÷ 645] x 100 = -66.51%
Formula
Percentage change = [(216 - 645) / 645] x 100
Subtract the new number by the original number
216 - 645 = -429
-429 ÷ 645 = -0.6651162790697674
-0.6651162790697674 x 100 = -66.51%