Answer
2003: $58.48~million$
2015: $62.17~million$
Work Step by Step
$P(t)=57.59e^{0.0051t}$
2003 corresponds to $t=3$:
$P(3)=57.59e^{0.0051\times3}=57.59e^{0.0153}=58.48$
2015 corresponds to $t=15$:
$P(15)=57.59e^{0.0051\times15}=57.59e^{0.0765}=62.17$
