16-5  Quality of Transport Routes
Item	1990	1995	2000	2005	2006
Length of National Railways in Operation (km)	53378	54616	58656	62200	63412
Double-Tracking Length                             (km)	13024	16909	21408	24497	25244
Proportion                                                     (%)	24.4	31.0	36.5	39.4	39.8
Automatic Blocking Length                        (km)	10370	12910	18318	24149	25630
Proportion                                                     (%)	19.4	23.6	31.2	38.8	40.4
Length of Highways                                     (km)	1028348	1157009	1402698	3345187	3456999
Expressway and Class I to IV Highways     (km)	741040	910754	1216013	1591791	2282872
Proportion                                                    (%)	72.1	78.7	86.7	82.5	66.0
Length of Navigable Inland Waterways    (km)	109192	110562	119325	123263	123388
Standard Waterways                                   (km)		56587	61367	61013	61035
Proportion                                                    (%)		51.2	51.4	49.5	49.5