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We present the first systematic comparison of the charged-particlepseudorapidity densities for three widely different collision systems, pp,p-Pb, and Pb-Pb, at the top energy of the Large Hadron Collider ($\sqrt{s_{\rmNN}} = 5.02$ TeV) measured over a wide pseudorapidity range (${-3.5 <\eta<5}$), the widest possible among the four experiments at that facility. Thesystematic uncertainties are minimised since the measurements are recorded bythe same experimental apparatus (ALICE). The distributions for p-Pb and Pb-Pbcollisions are determined as a function of the centrality of the collisions,while results from pp collisions are reported for inelastic events with atleast one charged particle at midrapidity. The charged-particle pseudorapiditydensities are, under simple and robust assumptions, transformed tocharged-particle rapidity densities. This allows for the calculation and thepresentation of the evolution of the width of the rapidity distributions and ofa lower bound on the Bjorken energy density, as a function of the number ofparticipants in all three collision systems. We find a decreasing width of theparticle production, and roughly a smooth ten fold increase in the energydensity, as the system size grows, which is consistent with a gradually higherdense phase of matter.

System-size dependence of the charged-particle pseudorapidity density at $\sqrt{s_{\rm NN}} = 5.02$ TeV for pp, p-Pb, and Pb-Pb collisions