Year	total route-km
1980	57653
1981	57665
1982	57742
1983	57774
1984	57944.5
1985	58405.8
1986	57855.8
1987	57834.45
1988	57888.02
1989	57911.37
1990	57638.955483871
1991	62694.455483871
1992	62820.455483871
1993	61885.815483871
1994	62668.815483871
1995	63128.905483871
1996	58509.035483871
1997	62018.445483871
1998	58513.445483871
1999	58664.435483871
2000	61677.935483871
2001	58128.935483871
2002	62217.935483871
2003	62331.935483871
2004	63000.935483871
2005	62019.935483871
2006	61447.935483871
2007	61430.935483871
2008	61146.935483871
2009	60715.935483871
2010	60717.935483871
2011	60952.935483871
2012	60491.935483871
2013	60491.435483871
2014	60490.935483871
2015	61969.935483871
2016	62035.935483871