Table:
text: Northwestern Conference (IHSAA)
Former members
Former members
School City Mascot County Year_joined Previous_Conference Year_Left Conference_Joined
East Chicago Roosevelt East Chicago Roughriders 45 Lake 1963 Northern Indiana 1968 Indiana Lake Shore
East Chicago Washington East Chicago Senators 45 Lake 1963 Northern Indiana 1968 Indiana Lake Shore
Gary Emerson Gary Tornado 45 Lake 1963 Northern Indiana 1981 none (school closed, reopened as Emerson VPA)
Gary Froebel Gary Blue Devils 45 Lake 1963 Northern Indiana 1969 none (school became MS, closed 1977)
Gary Mann Gary Horsemen 45 Lake 1963 Northern Indiana 2004 none (school closed)
Gary Tolleston Gary Blue Raiders 45 Lake 1963 Northern Indiana 1969 none (school became MS, closed 2007)

text: Northwestern Conference (IHSAA)
Former members
Former members
School City Mascot County Year_joined Previous_Conference Year_Left Conference_Joined
Hammond Hammond Wildcats 45 Lake 1963 Northern Indiana 1968 Indiana Lake Shore
Hammond Clark Hammond Pioneers 45 Lake 1963 Northern Indiana 1968 Indiana Lake Shore
Hammond Tech Hammond Tigers 45 Lake 1963 Northern Indiana 1968 Indiana Lake Shore
Valparaiso Valparaiso Vikings 64 Porter 1963 Northern Indiana 1968 Independents
Whiting Whiting Oilers 45 Lake 1963 Northern Indiana 1968 Indiana Lake Shore
Hammond Gavit Hammond Gladiators 45 Lake 1966 Independents 1968 Indiana Lake Shore
Hammond Morton Hammond Governors 45 Lake 1966 Independents 1968 Indiana Lake Shore
Hobart Hobart Brickies 45 Lake 1966 Independents 1968 Independents
Andrean Gary 59ers 45 Lake 1968 Independents 1975 Independents (school moved to Merrillville )
Gary Wirt Gary Troopers 45 Lake 1970 Calumet 2009 school closed

Question: What year did the Gary team join the Northwestern Conference (IHSAA) with the tornado mascot?