I want to know the answer to the following question:
How many people in Boston use public transportation?
All the background I'm provided with is that "Boston's subway system, the Massachusetts Bay Transportation Authority (MBTA—known as the "T") operates the oldest underground rapid transit system in the Americas, and is the fourth-busiest rapid transit system in the country, with 65.5 miles (105 km) of track on four lines.". Is that enough to answer the question?