Well Morpheus - I think not. These figures don't tally with the yearbooks.
Yearbook 2012 gives the end of service year 2011 figure for publishers ...
Peak 165,387 Average 162,894
The above chart gives Aug 2011 (Probably the start of August as we have Aug 2018 figure up there and it is not the end of August yet.) as 167,107 so whatever it is, it is higher than both the yearbook figures.
Now check their Nov 2016 figure of 168,763 and look at the yearbook figures for 2016 and 2017 end of service year ...
2016 (Peak) 165,624
2017 (Peak) 165,470
So obviously they are counting publishers differently.