Our first challenge was how to collect job postings over past years because job websites do not keep historical data for more than one year. Therefore, we used the Common Crawl dataset to address this problem (http://commoncrawl.org/). Common Crawl is a non-profit organization that builds and maintains an open repository of web crawl data that is, in essence, a copy of the Internet. Common Crawl data contains over 25 billion web pages (Batikas, Claussen, and Peukert, 2018) and is widely used in hundreds of research projects (Batikas, Claussen, and Peukert, 2018; Cafarella et al., 2018). Since we were only interested in the content from Indeed.com, we only examined a very small fraction of the Common Crawl corpus.