The given line graph illustrates data about amount of international conferences in some cities between 1965 to 2010.
Overall, there were considerable downward trends in two cities ( city A, city B), while in the city C experienced a substantial growth over the period. City A once the leading city, ended up with the fewest conferences by 2010.
Looking of the details, city A began with around 35 conferences in 1965, nearly 10 more than city B. However, city A reaching a low of 20 by 1975. City B similarly experienced a gradual decrease, ending the period at 25, which allowed it to maintain in the second position. The conference count for city A fell sharply and ended close to its 1975 level, making it city with the least conference by 2010.
City C , which did not host any conference in 1965, experienced steady growth, reaching 30 by 2010. This upward trend allowed city C to overtake both city A and city B, ultimately becoming the top city for hosting international meetings by the end of the period.