amount vs plateau

amount

verb
  • To total or evaluate. 

  • To be the same as or equivalent to. 

noun
  • The number (the sum) of elements in a set. 

  • A quantity or volume. 

  • The total, aggregate or sum of material (not applicable to discrete numbers or units or items in standard English). 

plateau

verb
  • (of a varying quantity) To reach a stable level after a period of increase; to level off. 

noun
  • A comparatively stable level after a period of increase. 

  • A notable level of attainment or achievement. 

  • A largely level expanse of land at a high elevation; tableland. 

How often have the words amount and plateau occurred in a corpus of books? (source: Google Ngram Viewer )