The graph illustrates how many worldwide meetings were held in three specific cities from 1963 to 2010. Overall, the quantities of global conferences in city A and B experienced declines of varying degrees, while those in city C increased, with the most prominent change being seen in this city. It is also reported that such a city ended up as the one organizing the most meetings.
Looking first at the number of conferences in city A and B, the former commenced the period with 35, about 10 higher than the corresponding figure for the latter, at nearly 30. Subsequently, there was a dramatic drop to a nadir of 20 after a decade. Interestingly, after a fluctuation lasting for 40 years, the number of meetings in city A dived and finished at the same level that it was in 1975. This change led to city A ending up being the city with the least conferences among others. A similar change, to a smaller extent, was observed in the meeting quantity held in city B, decreasing gradually to 25 at the end, sufficient to retain its second ranking.
Turning to the remaining, city C organized no conference in 1965, yet surged to 30 in 2010, displacing city A to become the one with the most conferences.