When Leslie first moved to Lime County one year ago, it had a population of about 711,500. Today, the population in the county is about 697,270, and it is expected that the population will continue to decline each year.

Write an exponential equation in the form y=a(b)x that can model the population of Lime County, y, x years after Leslie moved there.
Use whole numbers, decimals, or simplified fractions for the values of a and b.
y =