-67.49% is the change from 646 to 210
Calculation steps:
[( 210 - 646 ) ÷ 646] x 100 = -67.49%
Formula
Percentage change = [(210 - 646) / 646] x 100
Subtract the new number by the original number
210 - 646 = -436
-436 ÷ 646 = -0.6749226006191951
-0.6749226006191951 x 100 = -67.49%