example
diff along Category, Month of Order Date
Office Supplies January $8,006
February $5,826 ($2,179)
March $20,457 $14,630
April $9,179 ($11,277)
May $10,061 $882
June $12,282 $2,221
July $17,148 $4,866
August $25,730 $8,582
September $25,914 $184
October $26,157 $243
November $19,394 ($6,763)
December $24,495 $5,101