-68.11% is the change from 646 to 206
Calculation steps:
[( 206 - 646 ) ÷ 646] x 100 = -68.11%
Formula
Percentage change = [(206 - 646) / 646] x 100
Subtract the new number by the original number
206 - 646 = -440
-440 ÷ 646 = -0.6811145510835913
-0.6811145510835913 x 100 = -68.11%