-21.43% is the change from 210 to 165
Calculation steps:
[( 165 - 210 ) ÷ 210] x 100 = -21.43%
Formula
Percentage change = [(165 - 210) / 210] x 100
Subtract the new number by the original number
165 - 210 = -45
-45 ÷ 210 = -0.21428571428571427
-0.21428571428571427 x 100 = -21.43%