-91.9% is the change from 210 to 17
Calculation steps:
[( 17 - 210 ) ÷ 210] x 100 = -91.9%
Formula
Percentage change = [(17 - 210) / 210] x 100
Subtract the new number by the original number
17 - 210 = -193
-193 ÷ 210 = -0.919047619047619
-0.919047619047619 x 100 = -91.9%