* Please note that data are not necessarily comparable between survey periods. Please refer to the methodology section of each publication for more information.
Years Available: 2002, 2007, 2012
Permanent Link: http://data.sagepub.com/sagestats/5037
General Notes: *Median value gives the value for the "average" county for this metric, the 50th percentile of all counties reporting data. A # symbol indicates the following: Figure withheld to avoid disclosure pertaining to a specific organization or individual. A ! symbol indicates the following: Figure does not meet publication standard, entry would amount to less than half the unit of measurement shown, or base figure too small to meet statistical standards for reliability of a derived figure.