He said if the proposed filing is approved, workers' compensation rates will have decreased by 60% in Florida since 2003, when the state passed a sweeping workers' compensation law.

But Stephen Alexander, an actuary with the advocacy group Florida Workers' Advocates, testified that the rates should be reduced by 15.4% instead.

No time frame on decision

Altmaier is charged with reviewing the filing to ensure the proposed changes are not excessive, inadequate or unfairly discriminatory.

Altmaier will make the final decision but told reporters after the hearing he did not know when he would act on the rate filing.

"I want to make sure we are deliberate in our process," Altmaier said. "I don't want to put a time frame on it. I just want to make sure we do a diligent job and come to the right decision."

Related: 9 things insurance agents can do to help employers manage workers' comp costs

Alexander, formerly an actuary with the state's insurance consumer advocate, focused, in part, on underwriting in his proposal calling for deeper cuts.

NCCI has proposed a 2% underwriting profit in its rates for 2018, while Alexander is proposing a 4% underwriting loss. He said the 4%t figure is consistent with carriers' experiences in other states where NCCI recommends workers' comp rates.

Alexander also told Altmaier, for example, the state should scrap a rule that discourages rate deviation in the workers' compensation market. Just three out of 242 carriers deviate from NCCI rates today, he said.

Altmaier said after the meeting he would review the recommendations.

Workers' compensation is a no-fault system meant to protect workers and employers. It is supposed to provide workers who are injured on the job access to medical benefits they need to be made whole. Those who are injured for at least eight days also are entitled to indemnity benefits, or lost wages. In exchange for providing those benefits, employers generally cannot be sued in court for causing injuries.

Fla. businesses paid $3.8B in 2016

Florida businesses paid nearly $3.8 billion in workers' compensation premiums in 2016, up from about $2.8 billion in 2012. The costs for the mandatory coverage are the 33rd highest in the nation, according to NCCI.

While the system is supposed to be self-executing, injured workers hire attorneys when there are disputes over the amounts of benefits they should receive.

Related: Key to workers' compensation success: Adapt to changing environment

The proposed reduction in rates is in stark contrast to last year when NCCI requested a 19.6% increase in rates, the majority of which was attributable to a Florida Supreme Court ruling in a case where justices ruled that caps on attorney fees were unconstitutional. The Supreme Court, in a separate decision, also tossed out a restriction on benefits in the case of a St. Petersburg firefighter injured on the job.

14.5% premium increase in 2016

Ultimately, the state approved a 14.5% increase last year.

NCCI's Eddinger said the 2018 rate filing was based on the two most recent years of data, 2014 and 2015, and, therefore doesn't contain much data from after the 2016 Supreme Court decisions.

Related: Good news for N.Y. state employers: Workers' comp premiums to be reduced by $400

"We won't really see post-data come in until next year or the year after that," he said adding that about 5% of the claims data in the rate is impacted by the court decisions.

Christine Sexton reports for the News Service of Florida. She can be reached at [email protected].