I just completed some research based on a variety of industry data, here are my rough figures for overall offline YP category use. It should not be a shock to many of you but I thought it might help some people in search of general data. Take your pick on the number of lookups, 15 Billion seems a nice round figure for the year.
% - Category
15.6 - Health 14.2 - Food 13.8 - Automobiles 10.2 - Shopping (Consumer) 7.1 - Construction 4.2 - Supplies (Business) 3.6 - Finance & Insurance 3.5 - Home & Garden 3.4 - Professionals 3.2 - Entertainment 2.9 - Travel 2.5 - Beauty 2.2 - Pets 1.9 - Government 1.8 - Education 1.5 - Repairs 1.4 - Transport & Haulage 1.1 - Property & Real Estate 1.0 - Utilities & Fuel 1.0 - Domestic Cleaning 0.7 - Business Services 0.6 - Media 0.5 - Communication 0.4 - Weddings 0.4 - Motorcycles 0.4 - Employment 0.3 - Boats 0.3 - Agriculture 0.3 - Small Package Delivery
The data goes as far back as early in the year. I did more intense research of offline and online percentages for internal use and thought I'd share some of the less sensitive data. The offline list is not secret, it's just presented in a different way from some much longer lists (Top 300 etc).
I maybe should have stated that there are some significant differences between online and offline patterns.
Also, the online data that I have comes from the UK so it may not be of use to many of the US-based folk on here.