10000
U.K. (United Kingdom) 1994:
38500
U.K. (United Kingdom) 1995:
38500
U.K. (United Kingdom) 1996:
38000
U.K. (United Kingdom) 1997:
27500
U.K. (United Kingdom) 1998:
18000
U.K. (United Kingdom) 1999:
18500
U.K. (United Kingdom) 2000:
13800
U.K. (United Kingdom) 2001:
7500
U.K. (United Kingdom) 2002: