Keep Calm guys, this seems to be a yearly pattern. Consider the invites sent in May send their e-APR by June, then to meet the 6 Month promise CIC has to process these applications by DEC,2016. Hence these ITAs seem to be a part of the 2016 Quota, which as we all know has faced a massive setback due to increase in Refugee/Family Reunification Quota.
I believe the draws that would take place June onwards, would be counted in the 2017 Quota. The government says economic immigration would be their primary focus in 2017, and they have also said they plan to increase ITAs per Draw leading to a drop in CRS Requirement.
I know Speculation is the last thing that helps you with immigration/Express entry matter, so please dont take these statements as facts, but this is the picture i could get from a bit of research and after discussing this topic with a known consultant.
I myself am stuck at 461, but wasn't surprised the slightest bit after looking at these draw results.I hope this information helps you to keep your hopes high.