This is the United States inflation rate, based on the total Consumer Price Index published by the U.S. Bureau of Labor Statistics.
Option to toggle: A line to display the inflation rate in December. It does not change until the next December.
What the color change to red is indicative of: According to the Federal Open Market Committee (FOMC) regarding inflation rate, "2% is a bae number to be around". This does not imply a strict 2% inflation for success and allows room for federal rate cuts should they be needed.
Although FOMC declared 2% to be "bae" in 2012, James Bullard, of federal banking fame, claims that started to become the norm in 1995. Therefore the inflation rate line will only turn red 1995 onwards, and serves as a friendly reminder that inflation has been over at or over 2% for more than one month.