It was a simplistic attempt to extract the rural percentage of GDP from those categories that Mark linked to. Part of the problem with those GDP numbers is much of it like real estate and Healthcare is domestic churn, where the money changes hands within Canada and it's unclear if they are just roughly taking the price paid for the real estate as a whole, or the actual monies transferred at time of sale. Example if a house in North Van sells for 1.5 mil and the down payment is $500,000, does the StatCan numbers reflect the whole cost or the costs actually paid this year?
The thing about resources is that most of it leaves the country and earns hard revenue for the country and companies, in essence new money being injected into the system and balancing out money leaving the country to buy overseas goods. Domestic resources that go into manufacturing for export are in my opinion the most valuable of bit of GDP, as it create domestic churn and brings in new monies.