Write the Word or Phrase That Best Completes Each Statement $\mathrm { P } ( \mathrm { t } )$

Write the word or phrase that best completes each statement or answers the question.
-In 1992 , the population of a country was estimated at 5 million. For any subsequent year, the population, $\mathrm { P } ( \mathrm { t } )$ (in millions), can be modeled using the equation $\mathrm { P } ( \mathrm { t } ) = \frac { 250 } { 5 + 44.99 \mathrm { e } ^ { - 0.0208 \mathrm { t } } }$ , where $t$ is the number of years since 1992. Determine the year when the population will be 39 million.