Creating globally available map

I am working on an hospital application where i need to show blood group in every second page in drop down and getting values from them to the db tablessince blood group are not frequent changing entity so we are planning to create a map with key value pair and make available this map throughout application in order to avid creation of same map multiple timemy question is what can be the best way to achieve this.some of the quick options coming to my mind are[*]Create a map at application start up and place it in application context[*]Create a utility class which read a property file and fill map with these values or simply create map with exisitng blood type.but i am not sure how effective these options are as site will have to handle a good amount to user hits in near future.Thanks in advance
 
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