-22.1% is the change from 828 to 645
Calculation steps:
[( 645 - 828 ) ÷ 828] x 100 = -22.1%
Formula
Percentage change = [(645 - 828) / 828] x 100
Subtract the new number by the original number
645 - 828 = -183
-183 ÷ 828 = -0.2210144927536232
-0.2210144927536232 x 100 = -22.1%