Year	total route-km
1980	109099.7
1981	109605.7
1982	110857.7
1983	111752.7
1984	111294.7
1985	111555.7
1986	111021.7
1987	110393.7
1988	110357.7
1989	109798.7
1990	110146.635483871
1991	108600.635483871
1992	108762.635483871
1993	109002.635483871
1994	109247.635483871
1995	109898.635483871
1996	111281.635483871
1997	115382.635483871
1998	115428.935483871
1999	115767.935483871
2000	116568.935483871
2001	116948.935483871
2002	117064.935483871
2003	118060.935483871
2004	118559.935483871
2005	120205.935483871
2006	121491.935483871
2007	121723.935483871
2008	119687.935483871
2009	124044.935483871
2010	124725.935483871
2011	125473.935483871
2012	126014.935483871
2013	125989.235483871
2014	127033.935483871
2015	124578.835483871
2016	122156.335483871