The provided pie charts illustrate the percentage of students choosing different sorts of courses in the years 1984, 1994 and 2004.
Overall, it is obvious from the graph that while face-to-face and online courses witnessed an upswing, the opposite was true for the remaining categories. Additionally, studying in person with lecturers maintained its predominant popularity among the others across the 20-year period.
Regarding the sections with a descending trend, the proportion of undergraduates studying directly in classroom led the chart throughout the period given, starting at nearly seven-tenths, followed by more than a half, and ending at two-fifths. This was followed by correspondence courses, which attracted the second largest number of learners in 1984 and 1994 at 20%, but its figure fell by 5% at the end of the period. Notably, a new kind of class emerged lately in 1994, which was named online courses, receiving the least interest across ten-year period, hovering around 10%.
Turning to the multimedia courses which was the only segment experiencing an ascending trajectory, the students opting for it constituted the least in the beginning, at only 13%, after which it increased minimally to a quarter, prior to a surge to 35%, ranking second eventually.