villain is 32/2.2/0.5 over 90 hands. How much should i bet on this nasty river?

PokerStars No-Limit Hold'em, $1.00 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($16.50)
UTG+1 ($97)
MP1 ($136.35)
MP2 ($17)
MP3 ($74.40)
Hero ($122.75)
Button ($107.45)
SB ($78.95)
BB ($86.90)

Preflop: Hero is CO with 7, 7.
5 folds, Hero raises to $4, 2 folds, BB calls $3.

Flop: ($8.50) 5, 9, 4 (2 players)
BB checks, Hero bets $5, BB calls $5.

Turn: ($18.50) 7 (2 players)
BB checks, Hero bets $14, BB calls $14.

River: ($46.50) 3 (2 players)
BB checks, Hero ?