-21.45% is the change from 853 to 670
Calculation steps:
[( 670 - 853 ) ÷ 853] x 100 = -21.45%
Formula
Percentage change = [(670 - 853) / 853] x 100
Subtract the new number by the original number
670 - 853 = -183
-183 ÷ 853 = -0.21453692848769051
-0.21453692848769051 x 100 = -21.45%