Year Total length in use Under construction, planned year of first operation
1981 451 0
1983 567 0
1984 641 0
1985 643 0
1986 643 0
1987 643 0
1988 733 0
1989 1024 0
1990 1024 0
1991 1133 0
1992 1628 0
1993 1749 0
1994 2343 0
1995 2447 0
1996 2447 0
1997 2447 0
1998 2708 0
1999 2708 0
2000 2708 0
2001 2967 0
2002 3229 0
2003 3943 0
2004 4264 0
2005 4285 0
2006 5184 0
2007 5480 0
2008 5750 0
2009 6126 0
2010 6602 0
2011 6830 0
2012 6879 0
2013 7343 0
2015 7343 210
2016 7343 673
2017 7343 971