11-5  Basic Statistics on City Public Utilities
Data have covered the public utilities of all city units.
Item	1990	1995	2000	2010	2011
City Areas and Floor Space of Buildings
Urban Area                                                         (sq.km)	1165970	1171698	878015	178691.73	183618.02
Area of Built Districts                                        (sq.km)	12856	19264	22439	40058	43603
Area of Land Used for Urban Construction        (sq.km)	11608	22064	22114	39758	41861
Population Density of City Districts     (persons/sq.km)	279	322	442	2209	2228
Water Supply, Gas Supply and Heating
Annual Volume of Tap Water Supply(100 million cu.m)	382.3	481.6	469.0	507.9	513.4
Water Consumption for Residential Use	100.1	158.1	200.0	238.8	247.7
Per Capita Water Consumption for Residential Use(ton)	67.9	71.3	95.5	62.6	62.4
Coverage Rate of Urban Population with Access to Tap	48.0	58.7	63.9	96.7	97.0
Water                                                                     (%)
Gaswork Gas Supply                       (100 million cu.m)	174.7	126.7	152.4	279.9	84.7
Consumption of Gaswork Gas for Residential Use	27.4	45.7	63.1	26.9	23.9
Natural Gas Supply                          (100 million cu.m)	64.2	67.3	82.1	487.6	678.8
Consumption of Natural Gas for Residential Use	11.6	16.4	24.8	117.2	130.1
Liquefied Petroleum Gas                           (10 000 tons)	219.0	488.7	1053.7	1268.0	1165.8
Consumption of Liquefied Gas for Residential Use	142.8	370.2	532.3	633.9	632.9
Length of Gas Pipelines                             (10 000 km)	2.4	4.4	8.9	30.9	34.9
Coverage Rate of Urban Population with Access to Gas (%)	19.1	34.3	45.4	92.0	92.4
Area of Centralized Heating            (100 million sq.m)	2.1	6.5	11.1	43.6	47.4
Municipal Infra-structure
Length of Paved Roads at Year-end          (10 000 km)	9.5	13.0	16.0	29.4	30.9
Length of Paved Roads Per 10 000 Persons          (km)	3.1	3.8	4.1	7.5	7.6
Area of Paved Roads at Year-end     (100 million sq.m)	10.2	16.5	23.8	52.1	56.3
Per Capita Area of Paved Roads                          (sq.m)	3.1	4.4	6.1	13.2	13.8
Length of City Sewage Pipes                      (10 000 km)	5.8	11.0	14.2	37.0	41.4
Density of City Sewage Pipes                       (km/sq.km)	4.5	5.7	6.3	9.0	9.5
Public Traffic
Number of Public Vehicles under Operation at Year-end	6.2	13.7	22.6	38.3	41.3
(Buses and Trolley Buses, etc.)            (10 000 units)
Number of Public Transportation Vehicles	2.2	3.6	5.3	11.2	11.8
Per 10 000 Persons                                              (unit)
Taxis                                                        (10 000 units)	11.1	50.4	82.5	98.6	100.2
City Greening
Area of Green Land                            (10 000 hectares)	47.5	67.8	86.5	213.4	224.3
Per Capita Area of Parks and Green Land           (sq.m)	1.8	2.5	3.7	11.2	11.8
Number of Parks and Zoos                                   (unit)	1970	3619	4455	9955	10780
Area of Parks                                     (10 000 hectares)	3.9	7.3	8.2	25.8	28.6
Environmental Sanitation
Volume of Garbage Disposal                   (10 000 tons)	6767	10671	11819	15805	16395
Volume of Disposal of Excrement and Urine (10 000 tons)	2385	3066	2829	1951	1963
Number of Public Toilets per 10 000 Persons     (unit)	3.0	3.0	2.7	3.0	2.9
a) Before 2006, Urban Area is the area of the city proper.
b) Per capita data and coverage rate are calculated on the basis of urban population. Since 2006, those indicators are calculated on the basis of the
sum of districts area population and temporarily residing population, which are provided by the Ministry of Public Security.