Mon	numads	costads	sales
Jan	11	14.0	49.4
Feb	8	11.8	47.5
Mar	11	15.7	52.6
Apr	14	15.5	49.3
May	17	19.5	61.1
Jun	15	16.8	53.2
Jul	12	12.8	47.4
Aug	10	13.6	49.4
Sep	17	18.2	62.0
Oct	11	16.0	47.9
Nov	8	13.0	47.3
Dec	18	20.0	61.5
Jan	12	15.1	54.2
Feb	10	14.2	44.7
Mar	13	17.3	53.6
Apr	12	15.9	55.4