Here is the latest CCP(it is labeled differently in most states but you get the idea) from our Government.
http://www.gao.gov/assets/600/592552.pdfQuote:
State "Washington"
Approximate number of active permits (as of December 31, 2011 or unless otherwise noted) "351,000"
Approximate adult population (age 20 or over) per U.S. 2010 Census "4,955,000"
Ratio of active permits issued to adult population (age 20 or over) "7.1"
Length of time permit/license valid (years) for initial applicants "5 years"