Table 3: The degree of order of each subsystem.

YearCollecting
subsystem
Transporting subsystemDistributing subsystem

20060.61270.42770.4761
20070.69130.49670.5593
20080.70460.52330.5987
20090.74780.51860.6347
20100.80190.56240.6831
20110.80250.61760.7381