-66.36% is the change from 217 to 73
Calculation steps:
[( 73 - 217 ) ÷ 217] x 100 = -66.36%
Formula
Percentage change = [(73 - 217) / 217] x 100
Subtract the new number by the original number
73 - 217 = -144
-144 ÷ 217 = -0.663594470046083
-0.663594470046083 x 100 = -66.36%