million passengers. The crisis in the former Yugoslavia, which escalated in the second half of 1991, led to the introduction of economic sanctions by UN Security Council to Federal Republic of Yugoslavia, and the influx of a large number of displaced persons in Belgrade. Investments in the purchase of new vehicles, spare parts and maintenance of the infrastructure was minimal. During 1993, due to the inability of continuous maintenance of the public transport problems in the procurement of oil and tires, price growth, transport declined in the number of vehicles in traffic, so that at the end of the year only 400 vehicles were in operation. Some lines were eliminated or shortened. The function of public transport in Belgrade had been damaged. During 1994 and 1995, the GSP managed to raise the level of transportation, revitalize the fleet to an average of 909 vehicles on weekdays. At the beginning of 1998, in public transport private transporters were included. Compared to the previous year, it had 127 vehicles less, along with a tendency of further decline. The unified tariff system ceased to existand passed on ticketing in vehicles by the conductor. After the start of NATO bombing of Yugoslavia on 24 March 1999, GSP "Beograd" transferred to work in the war environment, which meant the abolition or curtailment of a large number of lines. In the aftermath of the NATO bombing, the problem was lack of vehicles. The unfavorable situation continued in 2000. The outdated fleet, low technical condition of vehicles, lack of spare parts, frequent reduction of traffic due to fuel shortages are only part of the problem that led to the introduction of emergency measures by the Republic government. Significant changes have taken place after the events of October 2000, when the city's new government has opted for the revitalization of the GSP, as a holder of public transport system in Belgrade. A goal that was set before GSP "Belgrade" was to reach the level of the enterprise from the beginning of the 1990s. By the end of the year, most of former lines were reestablished. 2011–present In 2011, GSP Belgrade began with the acquisition of new CAF Urbos 3 trams. By the end of 2012, it supplied 30 trams of this model. The new trams are commonly referred to as Španac (Spaniard) by Belgrade's residents. GSP Belgrade introduced BusPlus on 1 February 2012. BusPlus is an electronic payment