Timeline

Year/Month	2009				2010		2011	2012	2013	2014	2015	2016	2017	2018	2019		2020
Member	1	4	10	11	3	12	6	6			3	1	5	5	7	12
So Young
Bekah
Kahi
Juyeon
Jung-A
UEE
Lizzy
Ka Eun
Raina
E-Young
Nana