The given three pie charts cover the period from 1984 to 2004, outlining the percentage of courses that were followed by the students. Overall, it is evident that face-to-face courses consistently accounted for the highest proportion, whereas online courses represented the lowest level in the final year. While the share of face-to-face and correspondence courses decreased, the converse was true for mixed media courses. The most noticeable change is the introduction of online courses that showed a downward trend at the end of the period.
Regarding face-to-face and correspondence courses that had higher participation rates, the former initially stood at 67%. By 2004, it had steadily and significantly dipped to 40%. Meanwhile, the latter accounted for one-fifth of the total, ranking second in the initial year. Having remained stable in 1994, it marginally dropped to 15% after a decade.
As for the other types, mixed media courses constituted 13% in 1984. After two decades, their figure considerably rose to 35%, showing almost a three fold increase over the period. By contrast, online courses emerged in 1994, starting at only 11%. In 2004, their rate slightly fell to 10%.