-64.76% is the change from 911 to 321
Calculation steps:
[( 321 - 911 ) ÷ 911] x 100 = -64.76%
Formula
Percentage change = [(321 - 911) / 911] x 100
Subtract the new number by the original number
321 - 911 = -590
-590 ÷ 911 = -0.6476399560922064
-0.6476399560922064 x 100 = -64.76%