Year	total route-km
1995	23986
1996	23420
1997	23328
1998	23210
1999	22891
2000	22560
2001	20134
2002	20223
2003	19900
2004	19617
2005	19599
2006	19429
2007	19419
2008	19627
2009	19764
2010	19702
2011	19725
2012	19617
2013	18959
2014	18942
2015	18510
2016	18429
2017	18513
2018	18536
2019	18538
2020	18611
2021	18620