Particle ratios of $\ks$/K (left) and $\ph$/K (right) are presented for pp, high-multiplicity p--Pb, central d--Au, and central A--A collisions  as a function of the collision energy. Bars (when present) represent statistical uncertainties. Boxes represent the total systematic uncertainties or the total uncertainties for cases when separate statistical uncertainties were not reported. The value given by a grand-canonical thermal model with a chemical freeze-out temperature of 156 MeV  is also shown.