Table:
text: British Rail Class 170
Current fleet details
Current fleet details
Class_ Operator_ No_Built Year_Built Cars_per_Set Unit_nos_
Class 170/4 First ScotRail 10 2003–2004 3 170 425 - 170 434
Class 170/4 First ScotRail 12 2004–2005 3 170 450 - 170 461
Class 170/4 First ScotRail 2 2001 3 170 470 - 170 471
Class 170/4 First ScotRail 7 2004 3 170 472 - 170 478
Class 170/5 London Midland 17 1999–2000 2 170 501 - 170 517
Class 170/5 CrossCountry 6 1999–2000 2 170 518 - 170 523
Class 170/6 London Midland 6 2000 3 170 630 - 170 635

Question: In what year was number 7 in the British Rail Class 170 built?