With the tech industry spreading out all over the country, it should be no surprise that San Francisco’s population is in a constant state of flux between those coming and going.

Per Curbed SF, LinkedIn recently completed a study of its users with an eye on employee migration. The results showed that for every 10,000 LinkedIn users in the San Francisco area, 5.67 of them came from New York City in the last year, 5.15 hail from Boston, and 3.7 arrived from Chicago. 

While there is no study yet on which fields these workers are flocking to or fleeing, LinkedIn tracked skills for the report. The most abundant skills in the Bay Area are scripting languages Perl, Python, and Ruby; integrated circuit design; and cloud and distributed computing — a true testament to the Bay Area tech workforce. The most scarce skills in the Bay Area are healthcare management, sales, education, and teaching.

These skills are potentially directing traffic to and from the San Francisco area. As tech workers come flocking, those in education and healthcare may leave for a more opportunities elsewhere.

Cities the Bay Area lost the most workers to include Seattle, Portland, and Austin. For every 10,000 LinkedIn members in the San Francisco area, 4.14 workers moved to Seattle, 3.95 moved to Portland, and 1.58 moved to Austin in the last year.

When gains and losses are combined, however, San Francisco had the most migration to-and-from the city with Los Angeles. For every 10,000 LinkedIn members in San Francisco, a staggering 60.52 workers moved to or from Los Angeles in the last year.

For now it seems the push and pull is in flux, as the same LinkedIn report from earlier this year determined migration from New York was higher than it is currently, while the Bay Area was losing more workers to Portland than to Seattle. While the key players remain, where they’re living keeps changing.