Year	total route-km
1995	31997
1996	31910
1997	31879
1998	31793
1999	29171
2000	29330
2001	29503
2002	29410
2003	29327
2004	29304
2005	28470
2006	29620
2007	29976
2008	29959
2009	33698
2010	29929
2011	30071
2012	29406
2013	29979
2015	28866
2016	29236.65
2017	29248.142
2018	28241
2019	28157
2020	27872
2021	27716