Year	total route-km
1980	541859.435483871
1981	537748.387096774
1982	534552.1
1983	530467.941935484
1984	521189.064516129
1985	509233.925806452
1986	497550.938709677
1987	482975.664516129
1988	474600.470967742
1989	467598.54516129
1990	499597.364516129
1991	494883.851612903
1992	484500.887096774
1993	495025.138709677
1994	491446.635483871
1995	489349.65483871
1996	489423.177296862
1997	483945.32689211
1998	480801.47020934
1999	480000.721417069
2000	479408
2001	470605.297906602
2002	473406.703703704
2003	472412.00805153
2004	469756.00805153
2005	471339.00805153
2006	543038
2007	538370
2008	540386
2009	543830
2010	561880
2011	541403
2012	536224
2013	536355.3
2014	535060
2015	531324.33
2016	530603.52