BKK2 on 30 July 2008
However if you look at the graph in the presentation, it sure seems like the 37 million number is around mid year if the scale is accurate.
The graph says FY 07, but the scale isn't accurate as cut and pasting FY 07 time period to FY 06 it's more like 3/4 of a year, or FY 07 Q3, but not exact so it's not really to scale. The graph also says PS3 was over 12m, which was the case through FY 07 Q4, but not FY 08 Q1, or FY 07 Q3 as the graph would suggest if the scale was accurate.
The article seems unclear as to what timeframe the PSP statistic is referencing
Seems pretty clear to me:
According to the stats, PSP had sold 34 million and PS2 sold 127 million units as New Year hit.