  A detailed study of pseudorapidity densities and multiplicity distributions
of primary charged particles produced in proton-proton collisions, at $\sqrt{s}
=$ 0.9, 2.36, 2.76, 7 and 8 TeV, in the pseudorapidity range $|\eta|<2$, was
carried out using the ALICE detector. Measurements were obtained for three
event classes: inelastic, non-single diffractive and events with at least one
charged particle in the pseudorapidity interval $|\eta|<1$. The use of an
improved track-counting algorithm combined with ALICE's measurements of
diffractive processes allows a higher precision compared to our previous
publications. A KNO scaling study was performed in the pseudorapidity intervals
$|\eta|<$ 0.5, 1.0 and 1.5. The data are compared to other experimental results
and to models as implemented in Monte Carlo event generators PHOJET and recent
tunes of PYTHIA6, PYTHIA8 and EPOS.
