15-5  Quality of Transport Routes
Item	1990	1995	2000	2007	2008
Length of National Railways in Operation (km)	53378	54616	58656	63637	63975
Double-Tracking Length                             (km)	13024	16909	21408	25794	26599
Proportion                                                     (%)	24.4	31.0	36.5	40.5	41.6
Automatic Blocking Length                        (km)	10370	12910	18318	26526	28100
Length of Highways                                     (km)	1028348	1157009	1402698	3583715	3730164
Expressway and Class I to IV Highways     (km)	741040	910754	1216013	2535383	2778521
Proportion                                                    (%)	72.1	78.7	86.7	70.7	74.5
Length of Navigable Inland Waterways    (km)	109192	110562	119325	123495	122763
Standard Waterways                                   (km)		56587	61367	61197	61093
Proportion                                                    (%)		51.2	51.4	49.6	49.8