Geoffrey Banta
Analyst · SunTrust
Thank you, Allen, and good morning, everyone. I'll make a few comments about our operational performance and trends before turning things over to Janelle to present a summary of our financials. From an operating standpoint, we had a solid fourth quarter, generating a combined ratio of 92.6% versus a combined of 98.4% in last year's fourth quarter. For the entire year, we also saw improvement, generating a combined ratio of 97.5% versus a 100.4% combined in 2011.
In terms of more detailed operating results, in the fourth quarter of 2012, we increased our gross premiums written year-over-year by a strong 30.6%, the eighth straight quarter in which our top line has grown by double digits. For the entire year, our gross premiums written grew 20.8% to $329 million from $272 million in 2011. As has been the case throughout 2012, the fourth quarter increase was due to 2 factors.
First, we showed a historic 25% year-over-year increase in what we refer to as our debt sheet premium, that is premium for voluntary policies written during the quarter. Even more encouraging, the premium increase occurred during a period of increases in our pricing, continued evidence that our segment of the workers' comp market is hardening. The second factor in the increase in our gross premiums was a more than 100% increase in payroll audits and related premium adjustments to $7.9 million in the fourth quarter of 2012 from $3.8 million in Q4 '11.
Regarding payroll audits, specifically, we experienced a 60% increase over the year-ago quarter. For several quarters now, we have stated that we expect an end to these year-over-year increases in audit premium but we were obviously premature in this prediction and our audit premium increases have been a welcome, if surprising boost to our top line.
In terms of pricing, our effective loss cost multiplier for voluntary workers' comp written in the fourth quarter was 1.69 or 169% of the approved loss cost in the states that use this mechanism for pricing. This pricing represents a healthy year-over-year increase over our fourth quarter 2011 effective LCM of 1.56.
Our increased pricing, along with a second straight year of aggregate increases in state-mandated loss cost, has contributed to an increase of 19.9% in our average renewal premium. In turn, this has led to a strong increase in our fourth quarter premium retention to 96.4% in the fourth quarter of 2012 from 91.2% in Q4 '11.
Regarding losses, we saw a continuation of positive signs that began in the third quarter, including: decreased claim frequency, both payroll and premium based; decreased reported indemnity claims; and increased closure rates. On the other hand, our claims severities were up, reflecting the complex and unpredictable nature of the claims environment in which we operate. Taking the above into consideration and given the fact that 2012 accident year is still very green, we maintained our net current accident year loss and LAE ratio at 76.5%.
Relative to prior accident years, we experienced stabilizing development in the fourth quarter, resulting in a lowering of our overall ultimate loss in LAE estimate, for these prior years, by $2.7 million in the aggregate. In her comments, Janelle will provide further color around our loss ratio and its components.
Finally, in terms of expenses. Our total underwriting expenses increased by only 1% in 2012 while our net premiums earned increased 15.8%. We pride ourselves in strong expense management and in the intelligent application of technology for efficiency gains. And these factors, along with our top line growth, yield an -- yielded an excellent expense ratio of 21.1% in the 2012 calendar year.
With that, I will turn to Janelle to present details on our financials.