Year	total route-km
1980	59129.5
1981	59063
1982	59096.1
1983	59077.2
1984	59036
1985	59113.7
1986	59153.1
1987	58764.6
1988	58690.6
1989	58973.9
1990	58547.3
1991	58738.4
1992	56180.5
1993	70654
1994	69856.4
1995	68978
1996	67631.66
1997	68170
1998	68053
1999	68557
2000	68408
2001	65573
2002	65756
2003	65141
2004	64524
2005	64728
2006	64342
2007	64119
2008	64385
2009	64177
2010	64026
2011	63804
2012	63753
2013	63069
2014	62937
2015	62853.9
2016	62875.33