Key	Year	Country	Number of recorded cows	Percent of recorded cows	Number of  recorded herds	Percent of recorded herds	Average number of cows per recorded herd	Percent of  recorded herds per method A3	Percent of  recorded herds per method A4	Percent of  recorded herds per method A6	Percent of  recorded herds per method AT	Percent of  recorded herds per method B	Others	E-mail address of the responsible
11	2010	USA	4,349,798		20,873		208		25.7		74.3		DHI Participation	aipl.inquiry@ars.usda.gov
10	2009	USA	4,478,447		23,013		195						DHI Participation	inquiry@aipl.arsusda.gov
9	2008	USA	4,414,821		23,005		192						DHI Participation	inquiry@aipl.arsusda.gov
8	2007	USA	4,243,205		23,611		180						DHI Participation	inquiry@aipl.arsusda.gov
7	2006	USA	4,162,303		24,297		181						DHI Participation	inquiry@aipl.arsusda.gov
6	2005	USA	4,121,752		25,085		164						DHI Participation	inquiry@aipl.arsusda.gov
5	2004	USA	4 071 099		26 236		155		19.8		64.1	16.1	DHI Participation	rlaipl@aipl.arsusda.gov
4	2003	USA	4 232 629		27 784		152		19.5		64	16.5	DHI Participation	rlaipl@aipl.arsusda.gov
3	2002	USA	4 226 692		29 466		143		19.9		62.8	17.3	DHI Participation	rlaipl@aipl.arsusda.gov
2	2001	USA	4 282 206		31 196		137		20.6		61.7	17.7	DHI Participation	rlaipl@aipl.arsusda.gov