-79.64% is the change from 221 to 45
Calculation steps:
[( 45 - 221 ) ÷ 221] x 100 = -79.64%
Formula
Percentage change = [(45 - 221) / 221] x 100
Subtract the new number by the original number
45 - 221 = -176
-176 ÷ 221 = -0.7963800904977375
-0.7963800904977375 x 100 = -79.64%