The jobs added, 4,951,000, are not since 1-2009, but from 10-2009. From my own data downloads, I looked for 139,088,000 (the graph # for 1-2009) & found the month. I got them from http://research.stlouisfed.org, which got them from the BLS.
The lowest amount employed was 136,809,000,1-2010.
The amount employed 1-2009 was 140,436,000.
From the graph, it is unknown which month the figures are from. Usually when only one number for a year, it's the average, unless otherwise noted.
Where did those graphs come from? I tried to go to the base part of the URL, but "error." The maker is neither fully aware of using Excel for graph refinement, nor of explanatory notations, including labeling.