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Id Date_Join Date_Quit
16 2012 null
17 2012 2012
18 2013 2015
19 2014 2015
21 2017 null
22 2017 null
23 2018 null
24 2019 2022
25 2020 null
加入日期 加入人數 退出人數
2012 2 1
2013 1 0
2014 1 0
2015 0 2
2017 2 0
2018 1 0
2019 1 0
2020 1 0
2022 0 1