-22.66% is the change from 834 to 645
Calculation steps:
[( 645 - 834 ) ÷ 834] x 100 = -22.66%
Formula
Percentage change = [(645 - 834) / 834] x 100
Subtract the new number by the original number
645 - 834 = -189
-189 ÷ 834 = -0.22661870503597123
-0.22661870503597123 x 100 = -22.66%