Lindi,
Here are some countywide numbers (looks like there is a corrected figure for Jan 2006). I also threw in some numbers to show you what happened during the peak off the frenzy in Spring 2004. Bear in mind that January 2004 sales actually went into escrow in Nov/Dec 2003 before things really got nuts!
Avg price per sq ft January 2004 – $302 (avg = 1973 sq ft)
Avg price per sq ft April 2004 – $321 (avg = 2001 sq ft)
Avg price per sq ft June 2004 – $342 (avg = 2003 sq ft)
Avg price per sq ft January 2005 – $352 (avg = 1958 sq ft)
Avg price per sq ft January 2006 – $362 (avg = 2019 sq ft)
Avg price per sq ft January 2007 – $344 (avg = 2040 sq ft)
In both cases the avg house was comparable in size (2000 to 2050)