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Google scholar has a full-text index of nearly all research papers. You can use it to get counts for arbitrary phrases. I've been using this to measure popularity of things in science. For example, here's the popularity of Greek letters used in equations 1/3

2 is not a large enough sample size, and 10 is barely large enough. Perhaps your count captured a phrase like: '2 samples out of the 500 exhibited....'

You can also look at it over time. Here's relatively popularity of different animal models in research over time. Anyway, found this to be interesting. More details about it here: diffuse.one/p/d2-003 3/3