Given the task definition, example input & output, solve the new input case.
In this task, you will be presented with a question and you have to answer the question based on your knowledge. Your answers should be as short as possible.
Example: Who were the builders of the mosque in Herat with fire temples ?
Output: Ghurids
This is a good example. Ghurids were the builders of the mosque in Herat with fire temples.

New input case for you: What is an estimate ridership of this public transportation agency that operated bus and historic streetcar service in a city that was heavily affected by a hurricane on August 29 , 2005 ?
Output:
18.6 million riders