Key	Year	Country	Number of lactations	Length of the lactations (days)	Milk yield per recorded cow (kg)	Milk per cow in 305 days (kg)	Percent fat content (%)	Percent protein content (%)	Calving interval (days)	Others	E-mail address of the responsible
11	2008	The Netherlands	831959	356	9358	8574	4.30	3.45	422		w.koops@pz.agro.nl
9	2007	The Netherlands	826346	352	9278	8538	4,33	3,46	417		w
8	2006	The Netherlands	846802	350	9109	8429	4.34	3.46	415		w.koops@pz.agro.nl
7	2005	The Netherlands	869900	345	8867	8161	4,38	3,46	413
6	2004	The Netherlands	906412	346	8788	8071	4,37	3,45	414
4	2003	The Netherlands	892469	346	8737	8127	4,42	4,40	413
2	2002	The Netherlands	1105163	349	8704	7972	4,43	3,49	404
3	2001	The Netherlands	1072221	342	8601	7991	4,43	3,49	401