99.1% is the change from 221 to 440
Calculation steps:
[( 440 - 221 ) ÷ 221] x 100 = 99.1%
Formula
Percentage change = [(440 - 221) / 221] x 100
Subtract the new number by the original number
440 - 221 = 219
219 ÷ 221 = 0.9909502262443439
0.9909502262443439 x 100 = 99.1%