The method followed in computing deferred policy acquisition costs limits the amount of such deferred costs to their estimated realizable value. A premium deficiency exists if the sum of expected claim costs and claim adjustment expenses, unamortized acquisition costs, and maintenance costs exceeds related unearned premiums and expected investment income on those unearned premiums, as computed on a product line basis. We routinely evaluate the realizability of deferred policy acquisition costs. At December 31, 2006 and 2005, there was no premium deficiency related to deferred policy acquisition costs.
The total revenue for the Standard Commercial Segment of $75.3 million for the year ended December 31, 2006 was $32.3 million more than the $43.1 million reported the prior year. This 74.9% increase in total revenue was primarily due to an increase of $48.3 million in net premiums earned. Increased net investment income contributed an additional $2.2 million to the increase in total revenue. These increases were partially offset by lower ceding commission revenue of $15.6 million primarily due to the shift from a third party agency structure to an insurance underwriting structure and also affected by lower than expected profit sharing commission. The increase in total revenue was also partially offset by lower processing and service fees of $2.7 million attributable to the change to an insurance underwriting structure.
Personal Segment. Net premium written by the Personal Segment increased $3.9 million during 2005 to $37.0 million compared to $33.1 million during 2004. The increase was due mainly to AHIC assuming 100% of the Texas non-standard personal automobile business produced by this segment and underwritten by a third party, effective October 1, 2004. Prior to October 1, 2004, AHIC assumed only 45% of this business. Total premium production for 2005 declined $7.2 million, or 16.4%, to $36.3 million from the $43.5 million produced in 2004. The decline in produced premium reflected increased rate competition.
Net cash provided by our consolidated operating activities was $76.2 million for the year ended December 31, 2006 compared to $29.5 million for the year ended December 31, 2005. The increase in operating cash flow primarily resulted from the retention of business produced in the Standard Commercial Segment and Specialty Commercial Segment in 2006 that was not retained by us in 2005. The net effect on operating cash flows was an increase of $93.6 million resulting from an increase in collected premiums net of paid losses and loss adjustment expenses partially offset by lower collected commission and claim fee revenue. Increased collected commission revenue of $26.5 million primarily from the acquisition of the subsidiaries included in the Specialty Commercial Segment, increased collected investment income of $4.4 million and increased collected finance charges of $2.0 million primarily from the acquisition of PAAC were partially offset by an increase in paid operating expenses of $69.5 million driven primarily from these acquisitions, additional interest paid mostly on debt financing these acquisitions of $3.5 million and increased tax payments of $6.7 million due to higher taxable earnings.
Set forth below is a summary of long-term contractual obligations as of December 31, 2006. Amounts represent estimates of gross undiscounted amounts payable over time. In addition, certain unpaid losses and loss adjustment expenses are ceded to others under reinsurance contracts and are, therefore, recoverable. Such potential recoverables are not reflected in the table.