Year	total route-km
1980	97515
1981	97642
1982	98113
1983	98044
1984	97830
1985	96786
1986	96307
1987	96138
1988	95823
1989	95169
1990	136278
1991	135676
1992	134870
1993	138257
1994	137716
1995	137907
1996	136400
1997	134161
1998	133530
1999	133977
2000	134810
2001	130500
2002	130173
2003	130818
2004	129111
2005	130222
2006	130576
2007	130189
2008	131006
2009	134673
2010	135078
2011	135279
2012	130277
2013	131230
2014	131168
2015	129368.77
2016	130312.2