-66.72% is the change from 670 to 223
Calculation steps:
[( 223 - 670 ) ÷ 670] x 100 = -66.72%
Formula
Percentage change = [(223 - 670) / 670] x 100
Subtract the new number by the original number
223 - 670 = -447
-447 ÷ 670 = -0.6671641791044776
-0.6671641791044776 x 100 = -66.72%