There are many programs to automate that, e.g., I use g3data. Unfortunately raw data is still rarely released today. One tip if the raw data wasn't released as

There are many programs to automate that, e.g., I use g3data. Unfortunately raw data is still rarely released today. One tip if the raw data wasn't released as a computer file: Look for a dissertation associated with the journal article you want data from. Dissertations often have tabulated data in an appendix.