Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Title | Release date | Developer(s) | Publisher(s) | Genre(s) |
| --- | --- | --- | --- | --- |
| 187 Ride or Die | 2005-08-23 | Ubisoft | Ubisoft | Driving |
| 50 Cent: Bulletproof | 2005-11-17 | Genuine Games | Sierra Entertainment |  |
| 50 Cent: Blood on the Sand | 2009-02-20 | Swordfish Studios | THQ |  |
| 25 To Life | 2006-01-17 | Avalanche Software, Ritual Entertainment | Eidos Interactive |  |
| Gangland (video game) | 2004-02-14 | MediaMobsters | Whiptail Interactive |  |
| Gangsters: Organized Crime | 1998-11-30 | Hothouse Creations | Eidos Interactive |  |
| Gangsters 2 | 2001-06-01 | Hothouse Creations | Eidos Interactive |  |
| The Godfather: The Game | 2006-03-21 | EA Redwood Shores | Electronic Arts |  |
| The Godfather II | 2009-04-07 | EA Redwood Shores | Electronic Arts |  |
| Grand Theft Auto III | 2001-10-22 | DMA Design | Rockstar Games |  |
| Grand Theft Auto: Vice City | 2002-10-22 | Rockstar North | Rockstar Games |  |
| Grand Theft Auto: San Andreas | 2004-10-24 | Rockstar North | Rockstar Games |  |
| Mafia: The City of Lost Heaven | 2002-08-28 | Illusion Softworks | Gathering of Developers |  |
| Mafia II | 2010-08-24 | 2K Czech, Massive Bear Studios | 2K Games, 1C Company |  |
| Mob Rule | 1999-9-30 | Simon & Schuster Interactive | Studio 3 Interactive |  |
| Saints Row | 2006-08-29 | Volition | THQ |  |
| Saints Row 2 | 2008-10-14 | Volition, Inc. | THQ |  |
| Omerta - City of Gangsters | 2013-01-31 | Haemimont Games | Kalypso Media | Building Simulation, RPG |
Question:
number of gangster games released by developer rockstar north
Answer:
2