Key	Year	Country	Total number of dairy cows	Total number of dairy herds	Average of cows per herd	Average milk production per cow per year (kg)	Percent of fat production per cow per year (%)	Percent of protein production per cow per year (%)	Others	E-mail address of the responsible
10	2004	Luxembourg	39.879	991	40.2	6.755	4.20			armand.braun@herdbooks.lu
9	2003	Luxembourg	40.599	1.035	39.2	6.581	4.20			armand.braun@herdbooks.lu
6	2002	Luxembourg	42.076	1.071	39.3	6.433	4.18			armand.braun@herdbooks.lu
5	2001	Luxembourg	42.854	1.119	38.3	6.293	4.17			armand.braun@herdbooks.lu