45000
U.K. (United Kingdom) 1999:
55000
U.K. (United Kingdom) 2000:
38300
U.K. (United Kingdom) 2001:
36100
U.K. (United Kingdom) 2002:
32000
U.K. (United Kingdom) 2003:
26500
U.K. (United Kingdom) 2004:
23800
U.K. (United Kingdom) 2005:
17300
U.K. (United Kingdom) 2006:
tba
U.K. (United Kingdom) 2007: