Simone is an ecologist who studies the change in the tiger population of Siberia over time. The relationship between the elapsed time ttt, in years, since Simone started studying the population, and the number of tigers, N_{\text{year}}(t)N year (t)N, start subscript, start text, y, e, a, r, end text, end subscript, left parenthesis, t, right parenthesis, is modeled by the following function: Nyear(t)=612⋅(23)t Complete the following sentence about the monthly rate of change in the tiger population. Round your answer to two decimal places. Every month, the number of tigers decays by a factor of .