Table:
text: Pittsburgh Riverhounds
Year-by-year
Year-by-year
Year_ Division League Regular_Season Playoffs U_S_Open_Cup Avg_Attendance
1999 2 USL A-League 4th, Northeast Conference Semifinals Did not qualify 4559
2000 2 USL A-League 7th, Atlantic Did not qualify 2nd Round 3808
2001 2 USL A-League 3rd, Northern Quarterfinals Quarterfinals 3226
2002 2 USL A-League 4th, Northeast Did not qualify Did not qualify 2274
2003 2 USL A-League 3rd, Northeast Did not qualify 3rd Round 1783
2004 3 USL Pro Soccer League 1st, Atlantic Semifinals Did not qualify 1475
2005 3 USL Second Division 7th Did not qualify 1st Round 2236
2006 3 USL Second Division 3rd Semifinals 1st Round 2232

Question: In what year did the Pittsburgh Riverhounds team reach the conference semifinals?