AFCI requirements have been accepted by three different CMPs (2, 4, 18). Each individual and organization represented on those panels have had years - a decade - to research, review and study AFCI technology and USFA fire stats. And the data provided to the CMPs is independently produced by the USFA and CPSC, not NEMA or the AFCI manufacturers.
The data does show that residential fires are on the decline:
For the years 2009-2011, there was an average of 25,900 residential electrical fires. This resulted in 280 deaths, 1,125 injuries, and $1.1 billion in property losses. For the years 2011-2013, there was and average of 23,490 residential electrical fires. This is a decrease of 2,410 fires per year. Deaths during these years have decreased to 159 from 280. Injuries are down to 827 from 1,125. And property losses are down to just over $500 million from just over $1 billion.
Now nobody is claiming this substantial reduction in residential electrical fires can be attributed to AFCIs alone. But, there is plenty of evidence buried within these numbers that show fires as a result of arcing in malfunctioning wiring, cords, and devices have declined at the same rate. This reduction in fires can be attributed to AFCIs.
Let's look at this another way. The states that do not currently enforce AFCI requirements have much higher rates of residential fire and fire deaths as compared to those states that do enforce AFCI requirements. The two most residential fire-prone states in the south are Alabama and Mississippi. These two states also happen to have no state mandate for NEC adoption. However, states like Texas and Florida have significantly lower fire and fire deaths rates even though they are much bigger and more greatly populated. These two states happen to have a strong state mandate for NEC code adoption and enforcement. This is not a coincidence.
AFCIs are saving lives and property. And that is the exactly the purpose of the NEC.