Year	total route-km
1995	13856
1996	13837
1997	13853
1998	13862
1999	13875
2000	13868
2001	13868
2002	13856
2003	14387
2004	14395
2005	14272
2006	14472
2007	15011.52
2008	15041
2009	15044
2010	15590.12
2011	15680.563
2012	15438
2013	15582
2014	15506
2015	15711
2016	15650
2017	15559
2018	15618
2019	15718
2020	15848
2021	15963