Louisiana 529 Tax Deduction Limits

2 kids - max both 529 to state tax limit, $4800 per kid for married couple. Started first 5 years ago. I know you can carry your deduction forward if you go past this year's limit. Do they raise the deduction limit very often? Figure with inflation they will eventually but unsure if this is a common thing.

Assume some will say, why will they b/c it reduces the states tax roll