16-5  Quality of Transport Routes
Item	1990	1995	2000	2010	2011
Length of National Railways in Operation (km)	53378	54616	58656	66239	66050
Double-Tracking Length                             (km)	13024	16909	21408	29684	29884
Proportion                                                     (%)	24.4	31.0	36.5	44.8	45.2
Automatic Blocking Length                        (km)	10370	12910	18318	37500	34175
Length of Highways                                     (km)	1028348	1157009	1679848	4008229	4106387
Expressway and Class I to IV Highways     (km)	741104	910754	1315931	3304709	3453590
Proportion                                                    (%)	72.1	78.7	78.3	82.4	84.1
Length of Navigable Inland Waterways    (km)	109192	110562	119325	124242	124612
Standard Waterways                                   (km)	59575	64323	61367	62290	62648
Proportion                                                    (%)	54.6	58.2	51.4	50.1	50.3