The mid-rapidity yields ratio integrated over $|y| < 0.5$ for $\pbarp$ and $|y| < 0.8$ for $\LbarL$, $\XbarX$ and $\ObarO$. Squares, triangles and circles are for the data from pp at $\sqrt{s} = 0.9$, $2.76$ and $7$ TeV, respectively. The strangeness content increases along the abscissa. | |