-64.29% is the change from 899 to 321
Calculation steps:
[( 321 - 899 ) ÷ 899] x 100 = -64.29%
Formula
Percentage change = [(321 - 899) / 899] x 100
Subtract the new number by the original number
321 - 899 = -578
-578 ÷ 899 = -0.64293659621802
-0.64293659621802 x 100 = -64.29%