Looking at the count of 157 my take is this can't be for more than 4 to 6 work days of May 2014.
It doesn't say anywhere whether the data is for 1st day of May or 3 or 5 or 10 or 30 days since the process began on May 1st.
This year CIC has been a little smarter in not providing a date for which the data is (at least as of now, may be they will start doing that going forward). Even when the date is provided that date does not mean all applications that have come their office "until that date" since it is NOT real-time in that sense. Based on last year's experience many of us can tell you that. It usually has a lag of 4 to 10 weeks in terms of actual applications received at Syndey, NS and stamped by their mail room guys versus what's shown on CIC's website.
Think of it this way, every day 100s of application arrive at Sydney, NS from around the world. Although the stamping of mail room for receipt of applications is most likely done real-time everything else right from opening that package and checking details in the package will have a lag, as probably there will always be some inventory in their pipeline that needs to be thoroughly checked and evaluated from earlier (detailed checking takes time). With limited staff at their office and unlimited number of applications the lag might infact only increase over time. Makes sense?
Plus what I hear experienced folks on this forum say that status is more likely the status of PER issued, though I am not sure of that correlation. But if that were true then what CIC shows as number of applications received at their end is actually the number of applications that they have checked and found PER eligible, which can't be real-time at all (and will have a 4 to 10 weeks lag).
Trust the clarification helps! Best wishes!