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Year,Month,Company A, Company B,Company C,Company D 
1990, Jan,	10,			15,		 50,		21 
1990, Feb,	10,			15,		 20,		65
1991, Jan,	50,			65,		 10,		41 
1991, Feb,  96, 		45,		 70,	    25
2001, Jan,  10,         45,      16,        41 
2001, Feb,  56, 		75,		 30,	    69