Question: How many passengers does the MURL serve?

Context paragraphs:
Cruiseferry: A cruiseferry is a ship that combines the features of a cruise ship with a Ro-Pax ferry.  Many passengers travel with the ships for the cruise experience, staying only a few hours at the destination port or not leaving the ship at all, while others use the ships as means of transportation.

Jean-Claude Panet: Jean-Claude Panet, (b. December?  1719 – d. February 28, 1778) was from Paris, France and came to Canada at 20 years of age as a soldier in the colonial regular troops.  He arrived on a ship which was struck by an epidemic and many passengers and crew, including Bishop François-Louis de Pourroy de Lauberivière, died.

City Loop: The City Loop (originally called the Melbourne Underground Rail Loop or MURL) is a mostly-underground, partly surface-level and partly elevated subway and rail system around the central business district of Melbourne, Victoria, Australia.

Harbor Gateway Transit Center: Harbor Gateway Transit Center (formerly Artesia Transit Center) is a Metro Silver Line station and a large bus station at southern end of the Harbor Transitway located in the southwest corner of Interstate 110 (Harbor Freeway) and State Route 91 (Gardena Freeway) in Harbor Gateway close to Carson.  The station has 12 bus bays and 900 park and ride spaces, and is the southern terminus of the Metro Silver Line (line 910 only).  Many passengers connect to this station from other buses to transfer to the Silver Line.  Public restrooms for passengers as began installation in October 2012 and opened in February 2013.  The nextrip bus screens were installed in November 2012 and became fully functional in April 2013.  The large hub is undergoing station improvements.

South Gosforth Metro station: South Gosforth Metro station is located in a suburb of Newcastle upon Tyne in England.  It is a busy interchange station on the Tyne and Wear Metro where many passengers change between Green line services to/from the Airport and Yellow line services to/from the Coast.  During peak periods the station sees an intensive service with trains operating up to every 3 minutes to and from Newcastle city centre.

Tarbes–Lourdes–Pyrénées Airport: Tarbes–Lourdes–Pyrénées Airport (French: "Aéroport de Tarbes-Lourdes-Pyrénées" ) (IATA: LDE, ICAO: LFBT) is an airport 9 km south-southwest of Tarbes in the Hautes-Pyrénées "département" of France.  It handles scheduled and charter flights from across Europe, with many passengers Catholic pilgrims journeying to nearby Lourdes.  The airport can handle large aircraft such as the Boeing 747.

Bus: A bus (archaically also omnibus, multibus, motorbus, autobus) is a road vehicle designed to carry many passengers. Buses can have a capacity as high as 300 passengers.  The most common type of bus is the single-decker rigid bus, with larger loads carried by double-decker and articulated buses, and smaller loads carried by midibuses and minibuses; coaches are used for longer-distance services.  Many types of buses, such as city transit buses and inter-city coaches, charge a fare.  Other types, such as elementary or secondary school buses or shuttle buses within a post-secondary education campus do not charge a fare.  In many jurisdictions, bus drivers require a special licence above and beyond a regular driver's licence.

Crush load: A crush load is a level of passenger loading in a transport vehicle which is so high that passengers are "crushed" against one another.  It represents an extreme form of passenger loading, and normally considered to be representative of a system with serious capacity limitations.  Crush loads result from too many passengers within a vehicle designed for a much smaller number.  Crush loaded trains or buses are so heavily loaded that for most passengers physical contact with several other nearby passengers is impossible to avoid.

Boise Airport: Boise Airport (IATA: BOI, ICAO: KBOI, FAA LID: BOI) (Boise Air Terminal or Gowen Field) is a joint civil-military airport three miles south of Boise in Ada County, Idaho, United States.  The airport is operated by the city of Boise Department of Aviation and is overseen by an Airport Commission.  It is by far the busiest airport in the state of Idaho, serving more passengers than all other Idaho airports combined and roughly ten times as many passengers as Idaho's second busiest airport, Idaho Falls Regional Airport.

Melbourne Central railway station: Melbourne Central railway station is an underground station on the metro network in Melbourne, Australia.  It is one of five stations (and one of three underground) on the City Loop, which encircles the Melbourne CBD.  The station is under La Trobe Street, between Swanston and Elizabeth Streets, on the northern edge of the CBD.  The station is named after the Melbourne Central Shopping Centre which it is beneath.  It feeds into Melbourne's main metro network station, Flinders Street and also Southern Cross Melbourne's main regional terminus.  In 2013/14 it was the 3rd busiest station in Melbourne's metropolitan network, with 15.925 million passenger movements.

Supporting paragraphs: Melbourne Central railway station City Loop
Answer: 15.925 million