16-5  Quality of Transport Routes
Item	1990	1995	2000	2004	2005
Length of National Railways in Operation (km)	53378	54616	58656	61015	62200
Double-Tracking Length                             (km)	13024	16909	21408	23841	24497
Proportion                                                     (%)	24.4	31.0	36.5	39.1	39.4
Automatic Blocking Length                        (km)	10370	12910	18318	22724	24149
Proportion                                                     (%)	19.4	23.6	31.2	37.2	38.8
Length of Highways                                     (km)	1028348	1157009	1402698	1870661	1930543
Expressway and Class I to IV Highways     (km)	741040	910754	1216013	1515826	1591791
Proportion                                                    (%)	72.1	78.7	86.7	81.0	82.5
Length of Navigable Inland Waterways    (km)	109192	110562	119325	123337	123263
Standard Waterways                                   (km)		56587	61367	60842	61013
Proportion                                                    (%)		51.2	51.4	49.3	49.5