Current Density in a Conical Conductor

A steady current is maintained in a conical conductor with circular cross-sections. The radius of the smaller end is $r_1 = 2\ \text{mm}$, and the radius of the larger end is $r_2 = 6\ \text{mm}$. The current density is uniform across any cross-section. If the current density at the smaller end is $5.0 \times 10^6\ \text{A/m}^2$, what is the current density at the larger end?