entities.add(unemployment_percent);
//Add all entities to datastore & Memcache.
AsyncDatastoreService datastore = DatastoreServiceFactory.getAsyncDatastoreService();
AsyncMemcacheService memcache = MemcacheServiceFactory.getAsyncMemcacheService();
for (int i = 0; i < entities.size(); i++) {
/**
* We have to make sure that each entity is not null.
* The Vector could contain null entries, which
* occurs when there are problems generating