Table:
text: Chronology of business simulation video games
List
List
Year_ Game Developer Setting Platform Notes_
1983 Oil Barons Epyx Modern APPII, C64, DOS 
1984 Dodgy Dealer O.I. Consultants Ltd Modern ZX, BBC 
1984 Millionaire Incentive Software Modern ZX, BBC 
1984 Mugsy Melbourne House Historical ZX 
1984 The Biz Virgin Games Modern ZX 
1985 Make Millions Tom Snyder Productions Modern MAC 
1985 Stockmarket Amsoft/Argus Press Software Modern CPC 
1986 Mugsy`s Revenge Beam Historical C64, ZX Sequel to Mugsy.
1987 Earth Orbit Stations Karl Buiter Sci-fi APPII, C64 
1987 Ports of Call Aegis Historical AMI, DOS 
1988 Fugger, Die Ballhaus Historical AMI, C64 First title in the series.
1989 Black Gold (a.k.a. Oil Imperium) reLINE Historical AMI, C64, DOS, ST

Question: In the chronology of business simulation video games, how many games were produced in 1984?