${\it p_{\rm T}}$-integrated yields in pp collisions at different center-of-mass energies and midrapidity as a function of the event multiplicity for K$_S^0$ and $Λ$ (top panels), $Ξ$ and $Ω$ (bottom panels). $\sqrt{s} = 5.02$ TeV results are shown as black dots, $\sqrt{s} = 7$ TeV results as green squares and $\sqrt{s} = 13$ TeV results as red diamonds. Statistical uncertainties are represented as error bars and systematic uncertainties as boxes whose width represent the systematic error on the multiplicity determination. Linear combined fits are shown as dashed lines, while the quadratic fit to the $Ω$ progression is shown as a dotted line.