99 overpair in a multiway pot

[Daddy Warbucks]

Table is very loose and donkish. No reads on UTG raiser. Should i have raised the flop?

Party Poker No-Limit Hold'em, $2 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($213.50)
CO ($520.70)
Button ($185)
SB ($116.15)
BB ($78.67)
UTG ($139.30)

Preflop: Hero is MP with 9[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to $6</font>, Hero calls $6, CO calls $6, <font color="#666666">1 fold</font>, SB calls $5, BB calls $4.

Flop: ($30) 3[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets $6</font>, <font color="#CC3333">Hero raises to $22</font>, CO folds, SB folds, BB folds, UTG calls $16.

Turn: ($74) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $25</font>, Hero calls $25.

River: ($124) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG calls $139.30 (All-In), Hero folds.

Final Pot: $263.30