Year	total route-km
1980	32795
1981	32795
1982	32795
1983	32795
1984	32976
1985	32976
1986	32880
1987	32677.65
1988	32674.65
1989	32675
1990	32845.585483871
1991	32870.585483871
1992	32870.585483871
1993	32828.945483871
1994	32830.945483871
1995	32897.035483871
1996	32818.035483871
1997	32932.445483871
1998	32932.445483871
1999	33083.435483871
2000	32104.935483871
2001	32102.935483871
2002	32079.935483871
2003	32169.935483871
2004	33069.935483871
2005	32005.935483871
2006	32005.935483871
2007	32005.935483871
2008	31595.935483871
2009	31159.935483871
2010	31159.935483871
2011	31359.935483871
2012	30964.935483871
2013	30964.935483871
2014	30964.935483871
2015	30964.935483871
2016	30964.935483871