15-4 Length of Transportation Routes
(10 000 km)
Year
				Length of	Length of		Length of
	Length of	# Electrified	Length of	Navigable	Civil	# International	Petroleum
	Railways in	Railways	Highways	Inland	Aviation	Routes	and Gas
	Operation			Waterways	Routes		Pipelines
1952	2.29		12.67	9.50	1.31	0.51
1957	2.67		25.46	14.41	2.64	0.43	...
1962	3.46	0.01	46.35	16.19	3.53	0.44	0.02
1965	3.64	0.01	51.45	15.77	3.94	0.45	0.04
1970	4.10	0.03	63.67	14.84	4.06	0.44	0.12
1975	4.60	0.07	78.36	13.56	8.42	3.71	0.53
1978	4.86	0.10	89.02	13.60	14.89	5.53	0.83
1980	4.99	0.17	88.33	10.85	19.53	8.12	0.87
1985	5.21	0.42	94.24	10.91	27.72	10.60	1.17
1986	5.25	0.44	96.28	10.94	32.43	10.76	1.30
1987	5.26	0.46	98.22	10.98	38.91	14.89	1.38
1988	5.28	0.57	99.96	10.94	37.38	12.83	1.43
1989	5.32	0.64	101.43	10.90	47.19	16.64	1.51
1990	5.34	0.69	102.83	10.92	50.68	16.64	1.59
1991	5.34	0.78	104.11	10.97	55.91	17.74	1.62
1992	5.36	0.84	105.67	10.97	83.66	30.30	1.59
1993	5.38	0.89	108.35	11.02	96.08	27.87	1.64
1994	5.40	0.90	111.78	10.27	104.56	35.19	1.68
1995	5.46	0.97	115.70	11.06	112.90	34.82	1.72
1996	5.67	1.01	118.58	11.08	116.65	38.63	1.93
1997	5.76	1.20	122.64	10.98	142.50	50.44	2.04
1998	5.76	1.30	127.85	11.03	150.58	50.44	2.31
1999	5.79	1.40	135.17	11.65	152.22	52.33	2.49