Seattle listed the 100 special events that were most expensive for police to staff between 2010 and 2016.

The city of Seattle released an in-depth report Wednesday into how much it costs Seattle Police to staff special events. In 2016, it cost police $10 million to staff festivals, protests, and presidential visits, among other events.

The audit ranked the 100 most expensive special events for Seattle Police between 2010 and 2016.

The top event was the 2014 protests after the grand jury findings were released in the Ferguson case of Michael Brown. That cost nearly $1.7 million.

That combined with the Seahawks super bowl parade made 2014 the most expensive year for Seattle Police’s special events.

Number two on the top event list was the 2015 visit by Chinese President Xi Jinping. That cost more than $769,000, more than double President Barack Obama's visit last year, which cost $330,168.

The third most expensive event were the 2016 May Day protests, which cost Seattle Police more than $576,000.

And that's just the permitted events.

Take for example events that aren't permitted like Macklemore’s surprise concert at Neumos in February 2016. That led to more than $24,000 in wages.

The audit also found the city is not fully recovering the cost of Seattle Police wages. The average cost recovery rate last year was 27 percent.

The audit found there's no process right now for Seattle Police to follow up on these events to make sure parties involved are charged.

Last year pro sports was the largest category of special event spending. In 2016, it cost Seattle Police more than $2.6 million to staff professional games. That's 25 percent of the $10 million total cost of staffing more than 700 special events last year.