Write an exponential formula of the form f(t)=abt\displaystyle {f{{\left({t}\right)}}}={a}\cdot{b}^{{t}} to represent the following situation. Assume t\displaystyle {t} is in years.


The begining population is 203,000, decreasing by 3.63% annually.
f(t)\displaystyle {f{{\left({t}\right)}}}=