Year	total route-km
1980	32013
1981	32015
1982	32015
1983	31987
1984	32149.5
1985	32149.5
1986	32203.5
1987	32062.5
1988	32059.5
1989	32047.5
1990	31624.5
1991	31491
1992	31494
1993	31482
1994	31590
1995	31547
1996	31468
1997	31555
1998	31555
1999	31671.5
2000	30983
2001	30991
2002	31095
2003	31119
2004	31788
2005	30635
2006	30643
2007	30635
2008	30224
2009	29788
2010	29788
2011	29988
2012	29593
2013	29592.5
2014	29592
2015	29592
2016	29592