quantify a drama

To find order in the changes, we seek refuge, of a kind, in statistics: in my years in China, the number of airline passengers doubled; cell phone sales tripled; the length of the Beijing subway quadrupled. But I was less impressed by those numbers than by a drama that I could not quantify: two generations ago, visitors to China marveled most at the sameness of it all.

In the sentence, I don't think "a drama" can be quantified, so I extrapolate that the clause, "I could not quantify", is used to describe the word "numbers". Do you think so?