There were some released numbers for a 2012 GAO Study which can be found here in its entirety:
http://www.gao.gov/assets/600/592552.pdf
Pages 75 & 76 show permit holder numbers. Delaware holds ~5000 CCDW Permits for ~664,000 population .. 0.8% residents.(2012)
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These numbers include non-resident permits when annotated with footnote b, for example, UT with 19.3%. Also, these are numbers as of 12/31/2011. I recall a previous forum post that DE was at ~9000 permits. IMO, we are low and need to spread the word.
bThese states issue permits to residents and nonresidents, and the approximate number for these states includes permits issued to both groups. As a result, the ratios of active permit holders to adult population for these states reflect permit holders that do not reside in the state, which may result in a higher percentage.