After a certain medicine is ingested, its concentration in the bloodstream changes over time.
The relationship between the elapsed time, \( t \), in minutes, since the medicine was ingested, and its concentration in the bloodstream, \( C(t) \), in \( \mathrm{mg} / \mathrm{L} \), is modeled by the following function:
\[
C(t)=78 \cdot(0.62)^{t}
\]
Complete the following sentence about the percent change in the concentration of the medicine.
Every minute, \( \% \) of concentration is added to / subtracted from \( \vee \) the total concentration of the medicine in the bloodstream.