Year	total route-km
1980	236650.9
1981	236877.9
1982	237288.9
1983	238057.9
1984	237649.9
1985	239681.9
1986	240032.9
1987	239584.9
1988	239935.9
1989	240793.9
1990	243772.9
1991	241800.3
1992	240769.9
1993	245036
1994	244288
1995	244029
1996	243690.542105263
1997	243666.7
1998	243225
1999	244041
2000	244599
2001	241612
2002	241040
2003	241529
2004	240942
2005	268679
2006	269852
2007	268676
2008	266423
2009	271107
2010	271702
2011	272970
2012	272542
2013	271646.6
2014	275051
2015	274057.07
2016	274674.06