Thai IPOs listed on SET & MAI.

Regarding Thai IPO's and the incomplete praise they acclaim. A key reason most all Thai IPO's do well on the first few trading days is in good part because Thai speculators' & day-traders' pounce on them,  at first. This is not indicative of a successful IPO. Why does the Thai brokerage community -or the SET- not tabulate (like elsewhere) how IPO's stock prices perform say 3, 6, or 12 months later.  As this is the real gauge and test on how successful they are post listing, in retrospect, over time. 

This way all investors can evaluate with transparency how Thai IPO's fared,  well past just the first few speculative days. Also there should be a list the various broker/financial advisor which brought them public (IPO.). As is now: Thai IPO's success is really a who knows? Because to my knowledge, no long term follow-up tabulations on performance are published anywhere? Why not?