Since 2011, admittedly though I've not been listening to much new the past few months.
If anyone here hasn't given KARD a listen please do. They are amazing and they promote overseas which is awesome. Not to mention they are a successful co-ed group which is basically unheard of.
Also Dreamcatcher, they aren't exactly popular but they are a girl group that has more of a J-Rock sound then your typical KPop.
But yeah I basically listen to anything, whether that be artists from the Big 3 to smaller groups like TOPPDOGG or recently Limesoda. There is very few sub genres in KPop that I don't enjoy.