-99.54% is the change from 217 to 1
Calculation steps:
[( 1 - 217 ) ÷ 217] x 100 = -99.54%
Formula
Percentage change = [(1 - 217) / 217] x 100
Subtract the new number by the original number
1 - 217 = -216
-216 ÷ 217 = -0.9953917050691244
-0.9953917050691244 x 100 = -99.54%