Year	total route-km
1996	9442
1997	9458
1998	9496
1999	9501
2000	9499
2001	9508
2002	9514
2003	9474
2004	9526
2005	9528
2006	9639.33
2007	9655.416
2008	9661.027
2009	9674.002
2010	8615.388
2011	8829.314