Does anti-matter increase or decrease in entropy over time?

Antimatter is matter going backwards through time. From the perspective of a matter-based observer does antimatter:

• Increase in entropy (and therefore decrease in entropy in its own time)

OR

• Decrease in entropy (and therefore increase in entropy in its own time)

Option 2 would seem to explain why we don't see much anti-matter (it all went into energy.)

Which is correct? Does antimatter increase or decrease in entropy over time?