place too much emphasis on vs understate

place too much emphasis on

understate

verb

To state (something) with a lack of emphasis, in order to express irony.
To state (something) with less completeness than needed; to minimise or downplay.
To state a quantity that is too low.

How often have the words place too much emphasis on and understate occurred in a corpus of books? (source: Google Ngram Viewer )