-22.13% is the change from 827 to 644
Calculation steps:
[( 644 - 827 ) ÷ 827] x 100 = -22.13%
Formula
Percentage change = [(644 - 827) / 827] x 100
Subtract the new number by the original number
644 - 827 = -183
-183 ÷ 827 = -0.22128174123337363
-0.22128174123337363 x 100 = -22.13%