In my graph there isn't really a pattern for when I was squeezing the clothespin. I didn't get higher every time, or lower. It really just went, simply, up and down. My partner's data did go up during the first four trials, though. His data, for the first four trials were 83, 95, 97, 107. He did have a pattern.
These patterns in my partners table could indicate that he is getting stronger, in the first four trials.