"x","groupA","groupB","groupC","groupD"
"Jan","12","19","-9","2"
"Feb","16","21","-13","8"
"Mar","23","21","-24","9"
"Apr","38","34","25","23"
"May","42","46","34","26"
"Jun","34","42","32","26"
"Jul","2","34","21","27"
"Aug","21","32","-16","18"
"Sept","18","31","-18","12"
"Oct","12","21","-14","10"
"Nov","12","18","-14","10"
"Dec","2","8","4","10"