at a guess 2012/2013
but the orange achive on their website only goes back to 2015, yours if defo earlier having looked as you have a tapered headtube, they've been straight since 2014 i think, my first 5 was a 2014 and was more modern than yours in style, also 2014 was the first 27.5 version so i think i'm close with 2012/13