Year	total route-km
1980	25511
1981	25523
1982	25585
1983	25645
1984	25651.5
1985	26109.5
1986	25633.5
1987	25663.5
1988	25719.5
1989	25761.5
1990	25486.435483871
1991	25338.935483871
1992	25349.935483871
1993	24556.935483871
1994	24662.935483871
1995	24605.935483871
1996	24605.935483871
1997	24692.935483871
1998	24692.935483871
1999	24692.935483871
2000	25238.935483871
2001	25238.935483871
2002	25342.935483871
2003	25342.935483871
2004	26011.935483871
2005	25831.935483871
2006	25172.935483871
2007	25172.935483871
2008	24738.935483871
2009	24295.935483871
2010	24295.935483871
2011	24608.935483871
2012	24213.935483871
2013	24213.935483871
2014	24213.935483871
2015	24213.935483871
2016	24213.935483871