Year	total route-km
1995	2413
1996	2413
1997	2413
1998	2413
1999	2413
2000	2331
2001	2305
2002	2270
2003	2270
2004	2270
2005	2270
2006	2269
2007	2265
2008	2263
2009	1883
2010	1897
2011	1865
2012	1864
2013	1859
2014	1859
2015	1859.6
2016	1859.6
2017	1859.6
2018	1859.6
2019	1859.6
2020	1859.1
2021	1859.1