The line graph illustrates how the proportion of secondary school instructors aged 30 or less in four distinct countries varied from 2010 to 2017. Looking from an overall perspective, while the percentage of teachers under 30 at secondary schools in Japan and the Czech Republic saw upward trends, the opposite pattern could be observed in the figures for the remaining countries. Additionally, the Czech Republic had the lowest percentage of secondary school teachers under 30 despite undergoing an increase during the timeframe.
As for the Czech Republic and Japan, the proportions of instructors aged 30 or younger from secondary schools accounted for approximately 9% and 6%, respectively. In 2011, the figure for the Czech Republic saw a sharp increase to nearly 10%, before fluctuating mildly around this level during the following 6-year period, finishing at approximately 8% by 2017. Meanwhile, after experiencing a slight rise to nearly 11% in 2011, the figure for Japan remained unchanged for the next 2 years, before increasing to a larger extent to just over 15% at the end of the period.
Regarding Brazil and Luxembourg, the percentage of Brazilian secondary school teachers under 30 was exactly 20%, which was higher than the figure for Luxembourg, at roughly 18%. During the period from 2010 to 2017, while the former declined consistently to around 18%, the latter witnessed a plummet to 10% by 2017.