There are three lines that show the total, male and female mean ages. The three lines either increase or at rest and never decreased once(except 2005 to 2006 for females). The mean of the males is higher than the mean of females.

URL: http://www.singstat.gov.sg/statistics/visualising_data/chart/Mean_Years_Of_Schooling.html

What inference can we draw from this?

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