'year,split\n'
 '2011,train\n'
 '2012,train\n'
 '2013,train\n'
 '2014,train\n'
 '2015,train\n'
 '2016,train\n'
 '2017,train\n'
 '2018,train\n'
 '2019,dev\n'
 '2020,test\n'
 '2021,test\n'