NEW YORK (AP) -- The Fourth of July went off like a dud at the box office, as the Michael Bay sequel Transformers: Age of Extinction and the Melissa McCarthy comedy Tammy led the weakest summer holiday weekend in at least a decade.

The North American box office was down a whopping 44 percent over the July Fourth weekend last year, when Despicable Me 2 and The Lone Ranger opened.

This weekend sputtered not because of an oversized bomb like The Lone Ranger, but because of numerous factors, including that Hollywood simply didn't aim for big fireworks this year. The holdover Transformers led all films with an estimated $36.4 million, while Tammy had a below-expectations Friday-to-Sunday haul of $21.2 million.

"This ranks as one of the lowest Fourth of Julys ever," said Paul Dergarabedian, senior media analyst for box-office tracker Rentrak. "We always think of Fourth of July being a big weekend. This year, we just have to lick our wounds and look forward to Planet of the Apes and some other films to get us back on track."

Estimated ticket sales for Friday through Sunday at U.S. and Canadian theaters, according to Rentrak. Where available, latest international numbers are also included. Final domestic figures will be released today.

The top 10: 1. Transformers: Age Of Extinction, $36.4 million; 2. Tammy, $21.2 million; 3. Deliver Us From Evil, $9.5 million; 4. 22 Jump Street, $9.4 million; 5. How to Train Your Dragon 2, $8.


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8 million; 6. Earth to Echo, $8.3 million; 7. Maleficent, $6.1 million; 8. Jersey Boys, $5.1 million; 9. Think Like a Man Too, $4.9 million; 10. Edge of Tomorrow, $3.6 million.