Year	total route-km
1980	190059.2
1981	189867.2
1982	189850.2
1983	189886.2
1984	189759.2
1985	191455.2
1986	191338.2
1987	190998.2
1988	191140.2
1989	191730.2
1990	197867.2
1991	200548.6
1992	199548.2
1993	200213
1994	199671
1995	198658
1996	197192.502105263
1997	196722
1998	196187
1999	196660
2000	196114
2001	193145
2002	193340
2003	192727
2004	191794
2005	192494
2006	192398
2007	191169
2008	191774
2009	192887
2010	193808
2011	193556
2012	192660
2013	191811.6
2014	192960
2015	192236.38
2016	193619.21