Year	total route-km
1995	13736
1996	13537
1997	13660
1998	13642
1999	13601
2000	13545
2001	13597
2002	13597
2003	13770
2004	14203
2005	14204
2006	14205
2007	14205
2008	14205
2009	14192.2
2010	14184.1
2011	14319.4
2012	14758.9
2013	14767.1
2014	14767.1
2015	14767.1
2016	15529
2017	16040.3
2018	16060.8
2019	16060.8
2020	16063
2021	16005.6