Year	total route-km
1980	1000507.33548387
1981	996153.287096774
1982	994910
1983	992092.841935484
1984	983302.464516129
1985	975342.625806452
1986	963878.138709677
1987	949388.514516129
1988	941808.890967742
1989	938664.31516129
1990	977074.383
1991	973210.707096774
1992	964581.342580645
1993	973468.754193548
1994	970988.050967742
1995	968160.260322581
1996	971143.774885996
1997	970154.472375981
1998	964146.915693211
1999	963074.49690094
2000	968935.935483871
2001	956609.233390473
2002	962635.639187575
2003	959885.943535401
2004	958123.943535401
2005	989329.943535401
2006	1062032.93548387
2007	1060970.93548387
2008	1060664.93548387
2009	1056107.93548387
2010	1076589.93548387
2011	1057710.93548387
2012	1051859.93548387
2013	1051798.67548387
2014	1055263.93548387
2015	1051968.08548387
2016	1051767.60548387