The INSET statement insets a table directly on each component histogram with the sum of PopulationCount. SUM= requests a customized label and a field width of five and two decimal places for the sum statistic. NOFRAME suppresses the frame around the inset table. POSITION= specifies a compass point to position the inset. HEIGHT= specifies the height of the text. FONT= requests a software font for the text. 
inset sum='Total Population:' (4.1) / noframe position=ne
                                      height=2 font=swissxb;