Google Books Ngram Viewer: Algebra, Arithmetic, Geometry, Topology

This is Google Trends for all published (and scanned) English books in the past 200 years (1800-2000) about the ngrams: Algebra, Arithmetic, Set theory, Calculus, Geometry, Topology, Combinatorics, Number theory and Differential equations.
Click the figure below to see the illustration.

Zoom at: Google Books Ngram Viewer: Math.