Domains
| Year | 1981 | 1986 | 1991 | 1996 | 1997 | 1998 | 1999 | 2000 |
| No. | 1464.30 | 1717.70 | 1939.60 | 2302.60 | 2340.50 | 2357.10 | 2386.50 | 2410.90 |
| Year | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 |
| No. | 2419.85 | 2432.45 | 2451.77 | 2463.20 | 2476.66 | 2502.75 | 2522.64 | 2544.36 |
| Year | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | ||
| No. | 2569.42 | 2593.95 | 2614.07 | 2622.12 | 2632.24 | 2645.50 |
Operational Definitions
The length of footpath in kilometer.
