The first graph shows the total inventory for each month since April 2006. (Dept of Numbers data only goes back to 2006.)
While the Dept. of Numbers data isn't the most detailed in the world, it does offer additional corroboration to numerous claims by Realtor organizations that inventory is collapsing. This appears to be true, and also appears to be the case in national numbers, such as found in the inventory data put out by NAR last month.
Meanwhile, as you'd expect in a time of declining inventory, the median asking price has headed upward, and has increased year over year for the past 16 months in a row. During November, the asking price was up 7.5 percent year over year, increasing from $278,200 to $299,300.