In the end, the summer box office did rise above last year's but not by as much as many analysts had predicted and not enough to offset the dreadful months that preceded it this year, according to figures released Wednesday by The National Association of Theatre Owners. Nevertheless, with a 4.5 percent boost from last summer, the domestic box office ended up in record territory with a total tally of $546 million. Admissons, however -- the number of tickets actually sold, were virtually flat with 2010, suggesting that most of the revenue boosts derived from 3D and IMAX surcharges. For the year, box-office revenue remains down -- 4.3 percent from last year; admissions are down 5.1 percent.