Year	Pipe (km)
1983	32,693
1984	34,302
1985	36,476
1986	39,681
1987	41,084
1988	43,643
1989	46,203
1990	48,762
1991	51,322
1992	53,881
1993	56,440
1994	59,609
1995	66,508
1996	67,484
1997	67,743
1998	68,131
1999	86,480
2000	87,090
2001	88,786
2002	90,544
2003	92,283
2004	94,668
2005	96,976
2006	105,513
2007	113,085
2008	118,579