18-5  运 输 线 路 质 量|18-5运输线路质量|指标|1990|2000|2010|2013|2014||国家铁路营业里程(公里)|53378|58655.9|66239.019|66585.052|66989.216|#复线里程(公里)|13024|21407.9|29683.617|31854.468|32545.762|复线里程比重(%)|24.4|36.4974367454936|44.8128874010045|47.8402690141325|48.5835839607378|#自动闭塞里程(公里)|10370|18317.8|37500|38839.647|35395.93|公路里程(公里)|1028348|1679848|4008229|4356218.435|4463913|#等级公路里程(公里)|741104|1315931|3304709|3755567|3900834|等级公路里程比重(%)|72.0674324255991|78.3363137617213|82.448108628524|86.2116318554168|87.3859772804712|内河航道里程(公里)|109192|119325|124241.78|125852.97|126280.02|#等级航道里程(公里)|59575|61367|62290.22|64900.45|65362.28|等级航道里程比重(%)|54.5598578650451|51.4284517075215|50.1362907067172|51.5684691430007|51.7597954133995|