200NL Raise size on the river

[adamw005]

I have a note on the guy that says 'donk bet small w/ Q9 on Q52r, bet small on blank turn and river' He is running at 51/2.5/1.75 over 40 hands with a bet river of 43%.

PokerStars No-Limit Hold'em, $2 BB (5 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

Button ($221.30)
SB ($95.85)
<font color="#C00000">BB ($402.75)</font>
UTG ($152.90)
<font color="#C00000">Hero ($214.85)</font>

Preflop: Hero is MP with Q[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $6</font>, <font color="#666666">2 folds</font>, BB calls $4.

Flop: ($13) 3[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $6</font>, Hero calls $6.

Turn: ($25) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $14</font>, Hero calls $14.

River: ($53) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $40</font>, $188 or so effective stacks

I think flop and turn can both be played differently but I'm most interested in river. What's his range and optimal raise size?