ID,購入日,購入金額
"A",2020-06-01,600
"A",2020-07-12,500
"A",2020-08-12,1300
"A",2020-09-01,1500
"A",2020-09-02,1800
"A",2020-09-08,1500
"A",2020-09-20,3000
"A",2020-11-02,1200
"A",2021-01-21,1590
"B",2020-05-11,600
"B",2020-06-23,500
"B",2020-12-28,1270
"B",2021-02-21,1350
"B",2021-04-03,1150
"C",2020-04-05,900
"C",2020-09-12,1850