This excerpt taken from the ALL 8-K filed Feb 10, 2010.
(3) Incurred Losses
Incurred losses (which include catastrophe losses) and Catastrophe losses, exclude the effects of those events for which the exposure is now covered, at least in part, by permanent industry reinsurance or insurance mechanism (i.e., Florida Hurricane Catastrophe Fund (FHCF), California Earthquake Authority) or with Hawaii hurricanes, coverage is being brokered to a non-affiliated insurance company. Mechanisms such as the FHCF and external reinsurance are available and are reflected in our capital structure and help mitigate exposure to these types of events. For the period 1992 - 2009, Incurred losses and Catastrophe losses for the Hurricane exposure states were adjusted to exclude $1.8 billion for losses related to Hurricane Andrew. Incurred losses and Catastrophe losses for the Other catastrophe exposure states were adjusted to exclude an additional $1.8 billion for losses related to certain California earthquakes and Hawaii hurricanes. Subsequent catastrophes of a similar magnitude are not excluded from the exhibit. Through the use of the insurance mechanisms, Allstate may have a contingent liability for industry assessments and losses exceeding the claims paying capacity of these mechanisms as discussed in the Annual Report on Form 10-K.