-0.9% is the change from 221 to 219
Calculation steps:
[( 219 - 221 ) ÷ 221] x 100 = -0.9%
Formula
Percentage change = [(219 - 221) / 221] x 100
Subtract the new number by the original number
219 - 221 = -2
-2 ÷ 221 = -0.00904977375565611
-0.00904977375565611 x 100 = -0.9%