25-3  Basic Statistics on City Public Utilities|25-3BasicStatisticsonCityPublicUtilities|Datahavecoveredthepublicutilitiesofallcityunits.|Item|1990|1995|2000|2010|2014|2015||CityAreasandFloorSpaceofBuildings|UrbanArea(sq.km)|1165970|1171698|878015|178691.73|184098.59|191775.54|AreaofBuiltDistricts(sq.km)|12856|19264|22439|40058.01|49772.63|52102.31|AreaofLandUsedforUrbanConstruction(sq.km)|11608.3|22064|22113.7|39758.42|49982.74|51584.1|PopulationDensityofCityDistricts(persons/sq.km)|279|322|442|2209|2419|2399|WaterSupply,GasSupplyandHeating|AnnualVolumeofTapWaterSupply(100millioncu.m)|382.3|481.6|468.9838|507.874514|546.661256|560.472843|WaterConsumptionforResidentialUse|100.1|158.1|199.996|238.752505|275.691137|287.269503|PerCapitaWaterConsumptionforResidentialUse(ton)|67.9|71.3|95.5|62.6|63.41145|63.6779|CoverageRateofUrbanPopulationwithAccesstoTap|48|58.7|63.9|96.68|97.64|98.07|Water(%)|GasworkGasSupply(100millioncu.m)|174.7|126.7|152.4|279.938034|55.951269|47.137801|ConsumptionofGasworkGasforResidentialUse|27.4|45.7|63.1|26.876319|14.577267|10.830568|NaturalGasSupply(100millioncu.m)|64.2|67.3|82.1|487.580814|964.378286|1040.79062|ConsumptionofNaturalGasforResidentialUse|11.6|16.4|24.8|117.15962|196.887842|208.006091|LiquefiedPetroleumGas(10000tons)|219|488.7|1053.7147|1268.00535|1082.849026|1039.216892|ConsumptionofLiquefiedGasforResidentialUse|142.8|370.2|532.2828|633.85226|586.212486|587.10623|LengthofGasPipelines(10000km)|2.4|4.4|8.9|30.867964|47.460026|52.838794|CoverageRateofUrbanPopulationwithAccesstoGas(%)|19.1|34.3|45.4|92.04|94.57|95.3|AreaofCentralizedHeating(100millionsq.m)|2.1|6.5|11.1|43.5668|61.124586|67.220487|MunicipalInfra-structure|LengthofPavedRoadsatYear-end(10000km)|9.5|13|16|29.4443|35.233333|36.49776|LengthofPavedRoadsPer10000Persons(km)|3.1|3.8|4.1|7.46014573536566|7.91261708352759|7.93440604391018|AreaofPavedRoadsatYear-end(100millionsq.m)|10.2|16.5|23.8|52.13218|68.30279|71.767511|PerCapitaAreaofPavedRoads(sq.m)|3.1|4.4|6.1|13.21|15.339276105573|15.6018498953029|LengthofCitySewagePipes(10000km)|5.8|11|14.2|36.9553|51.11785|53.956698|PublicTraffic|NumberofPublicVehiclesunderOperationatYear-end|6.2|13.7|22.6|38.3|47.6255|50.2916|(BusesandTrolleyBuses,etc.)(10000units)|NumberofPublicTransportationVehicles|2.2|3.6|5.3|11.2|12.9935204873154|13.2918805826864|Per10000Persons(unit)|Taxis(10000units)|11.1|50.4|82.5|98.6|107.4386|109.2083|CityGreening|AreaofGreenLand(10000hectares)|47.5|67.8|86.5|213.4339|252.796249|266.956674|PerCapitaAreaofParksandGreenLand(sq.m)|1.8|2.5|3.7|11.18|13.08|13.3499766083702|NumberofParksandZoos(unit)|1970|3619|4455|9955|13074|13834|AreaofParks(10000hectares)|3.9|7.3|8.2|25.8177|36.8|38.380453|EnvironmentalSanitation|VolumeofGarbageDisposal(10000tons)|6767|10671|11818.88|15804.8|17860.18|19141.87|VolumeofDisposalofExcrementandUrine(10000tons)|2385|3066|2829|1950.52|1551.97|1436.77|NumberofPublicToiletsper10000Persons(unit)|3|3|2.7|3.02332475271607|2.7939698221615|2.74664690987005||a)Before2006,UrbanAreaistheareaofthecityproper.|b)Percapitadataandcoverageratearecalculatedonthebasisofurbanpopulationbefore2006.Since2006,thoseindicatorsarecalculatedonthe|basisofthesumofdistrictsareapopulationandtemporarilyresidingpopulation,whichareprovidedbytheMinistryofPublicSecurity.