The starting point of 100 is for June 2009 for each series, so subsequent amounts are a percent increase or decrease measured from there. A measure of 118 means an 18% increase vs. June 2009 for instance. The image is built using the FRED database.[1]
U.S. Bureau of Labor Statistics, Civilian Noninstitutional Population [CNP16OV], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CNP16OV
U.S. Bureau of Labor Statistics, Civilian Employment Level [CE16OV], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CE16OV