The given chart depicts the proportion of university students receiving a degree in four different nations over a period of 50 year starting from 1961.
Overall,it is obvious that the data for these countries all followed an upward trend over the given period.
Looking at the details,we can see that the graduation rate in Portugal started at 15%,before receiving a noticeable increase to 30% in the next 10 years.Then the percentage fell to 25% in 1981,but bounced back right after that with another significant expansion,then slighutly decreased to approximately 35% in 2001.In the next decade,the proportion reached its peak at 40%.Moving to Italian students,the proportion was just under 25% in 1961,then receiving a decline to 20% in the next 30 years.But in the next two decades,it went up by a mile to peak at roughly 43% at the end of the period.
Meanwhile,the number for French college students saw an increase in the first three decades,from around 3% to exactly 15% in 1991 then remained unchanged until 2011.Also,the data for Spain also went up considerably to 15% in 1991,before steadily went up to just under 20% in the next 20 years