At one time Verisign reported the number of parked domains but stopped that practice a few years back.
The last time Verisign reported the number or percentage of parked domains on a .com or a .net domain name that number totaled 7%.
In recent years Verisign has been lumping parked domains into a category with “One page websites” which “include under-construction, brochure-ware and parked pages in addition to online advertising revenue generating parked pages.”
Assuming that the percentage of “under construction pages” stayed steady over the years (actually one would think they would have gone down) lets look at the percentage of
In October 2009 the percentage of .com/.net domains sitting this description were 24%.
In November 2010 the percentage of .com/.net domains sitting this description were 22%.
In January 2012 the percentage of domain names meeting this description is down to 17%.
So it would appear that the percentage of parked pages has declined over the years which of course is not surprising as revenues for such pages has declined while prices for renewals have increased.
However it could also be that the percentage of parked pages has simply not kept at the same pace as the increase of overall domain name registrations.
Its too bad that Verisign doesn’t report actual numbers for parked domains any longer leaving us to guess.