Updated

Grand Canyon National Park has surpassed its visitation record for the second year in a row.

The Arizona Daily Sun reports that the park announced Monday that it had received its 6 millionth visitor, a 9 percent increase over the 5,520,736 visitors from 2015.

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The park believes its traffic is up this year because the National Park Service is celebrating its centennial and has increased marketing for the event.

Last year was also record-breaking for the park: 2015 marked the first time more than 5 million people visited the park in a year.

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The Grand Canyon hit the 4-million-visitor mark in 1992.

The 6 millionth visitors were the Johnson family from Las Vegas, who were at the Grand Canyon for the first time.