-51.66% is the change from 211 to 102
Calculation steps:
[( 102 - 211 ) ÷ 211] x 100 = -51.66%
Formula
Percentage change = [(102 - 211) / 211] x 100
Subtract the new number by the original number
102 - 211 = -109
-109 ÷ 211 = -0.5165876777251185
-0.5165876777251185 x 100 = -51.66%