Akiba started studying how the number of branches on his tree changes over time. The relationship between the elapsed time, ttt, in years, since Akiba started studying his tree, and the total number of its branches, N(t)N(t)N, left parenthesis, t, right parenthesis, is modeled by the following function:
N(t)=42⋅(1.75)t
Complete the following sentence about the yearly percent change in the number of branches.
Every year,
\%%percent of branches are

the total number of branches.