The datasheet gives specs for output voltage when sourcing or sinking 24mA in table 6. That's a good indication that in normal operation you can reasonably expect it to handle about half of the Abs.Max. +/-50mA output current specced in table 4. You could probably push it to about 2/3 the Abs.Max. current but the voltage drop is unspecified and likely to be excessive, so that's a dumb idea for any production design.
Also, the total current available from all the outputs is limited by the Abs.Max. Icc (supply) and Ignd (ground) currents, namely 100mA (table 4). That means the total current sourced by all logic '1' outputs must *NOT* exceed 100mA, and similarly but independently, the total current sunk by logic '0' outputs must also not exceed 100mA. If there is any possibility of all Qn outputs being high simultaneously or low simultaneously, its only good for +/-12.5mA per Qn pin!