16-5  Quality of Transport Routes
Item	1990	1995	2000	2003	2004
Length of National Railways in Operation (km)	53378	54616	58656	60446	61015
Double-Tracking Length                             (km)	13024	16909	21408	23702	23841
Proportion                                                     (%)	24.4	31.0	36.5	39.2	39.1
Automatic Blocking Length                        (km)	10370	12910	18318	21920	22724
Proportion                                                     (%)	19.4	23.6	31.2	36.3	37.2
Length of Highways                                     (km)	1028348	1157009	1402698	1809828	1870661
Expressway and Class I to IV Highway      (km)	741040	910754	1216013	1438738	1515826
Proportion                                                    (%)	72.1	78.7	86.7	79.5	81.0
Length of Navigable Inland Waterways    (km)	109192	110562	119325	123964	123337
Standard Waterways                                   (km)		56587	61367	60865	60842
Proportion                                                    (%)		51.2	51.4	49.1	49.3