Year to date deed statistics

I calculated the number of deeds recorded for each town in the Middlesex North Registry of Deeds district for January and February 2011 and 2012 and show the numbers below along with the percentage change.  The first number is Jan+Feb 2011, the second is Jan+Feb 2012:

Billerica - 77 - 73 - down 5%
Carlisle - 11 - 20 - up 80%
Chelmsford - 80 - 91 - up 14%
Dracut - 86 - 89 - up 4%
Dunstable - 4 - 6 - up 50%
Lowell - 195 - 204 - up 5%
Tewksbury - 66 - 82 - up 24%
Tyngsborough - 28 - 28 - no change
Westford - 63 - 62 - no change
Wilmington - 63 - 69 - up 10%