The following chart is based on a more comprehensive (nearly half a century!) file of my output than what I posted on the Chronologically Arranged Listing of Publications page. That one contains 337 entries (as of December 2018) while this one counts 356 in all. [Please click on the image for enlargement.]
The discrepancies begin with a different start year, owing to the inclusion of articles I’d delisted in the blog version as juvenilia. One difficulty in the method is that it counts any single publication as one. This could range from short reports to books. The late-1990s drought, for example, owes to the fact that I’d been writing academic papers during graduate school (many of which I compiled in a book, accounting for a year’s sudden spike), alongside my doctoral dissertation. I noticed as well that the years when I needed to adjust to non-writing jobs tended, logically enough, to impinge on my productivity, requiring a few couple of years for me to bounce back.
What struck me about the chart was the apparent high yield during the late 1980s, exceeding my freelance period of 1980-81. From personal experience, however, it felt like I was doing more writing recently than I ever had before – and again, it all boiled down to the question of the nature of output. With my tenured status in a more supportive non-Philippine educational institution, I was able to devote more time to writing, but these focused on academic articles and an occasional book volume.
The surest way of determining productivity would be by performing a word count of each entry and tabulating word output per year. That would of course require the kind of dedication to positivist projects that I can no longer muster. A less difficult means would be to count number of pages instead – a predicament for the articles whose copies I no longer possess, and a challenge that requires patience and obsession and time to spare (none of which I have enough of right now). As of this writing (December 2018), the last two years in the chart still have to transpire, so some of the items being counted are finished works awaiting publication, or planned output that I have announced. I imagine (though I don’t hope) that I might be writing to my end of days, so the definitive version of this study, assuming it’s worth completing, may just have to be undertaken by others.