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
10	2011	Northern Ireland	91468	331	8449	7433	4.02	3.24	420		suzanne@holstein-uk.org
9	2010	Northern Ireland	88618	331	8082	7127	4.08	3.27	420		suzanne@holstein-uk.org
8	2009	Northern Ireland	94695	327	8051	7130	4	3.25	420		suzanne@holstein-uk.org
7	2008	Northern Ireland	99071	327	8128	7170	3.92	3.22	416		suzanne@holstein-uk.org
6	2007	Northern Ireland	92620	318	8012	7176	3.93	3.19	413		suzanne@holstein-uk.org
5	2006	Northern Ireland	88398	318	7922	7142	3.94	3.22	411		suzanne@holstein-uk.org
4	2004	Northern Ireland	72,360	305	7,310	7,310	3.75	3.19	406
3	2003	Northern Ireland	70,972	305	7,192	7,192	3.70	3.18	404
2	2002	North Ireland	74771	305	7103	7103	3.78%	3.20%	400
1	2001	North Ireland	72,267	305	7029	7029	3.83%	3.23%	397