Of course the 2011 Memorial attendance figures are higher than 2014; the 2011 Memorial was held on a Sunday. This year's was on a Monday. Sunday Memorials are always well-attended; midweek not so much.
You see, contrary to what the WTS would have you believe, Memorial attendance has very little (almost nothing) to do with growth or potential interest. It has everything to do with the number of inactives, unbelieving relatives, and non-progressive return visits that can be bothered/persuaded/guilt-tripped to show up. And for these people, the threshold for not attending is quite low.
Memorial attendance figures have zero correlation with growth in this organization. How many JW's attended the Memorial as their first meeting? Ask around, and you'll find that the number is excruciatingly low.