how many company were founded in the same year as sentraal-suid koöperasie ?
select attr_open count attr_open distinct var_uri attr_close as var_c attr_close where brack_open var_uri rdf_type dbo_Company sep_dot var_uri dbo_foundingYear var_year sep_dot dbr_Sentraal-Suid_Koöperasie dbo_foundingYear var_year sep_dot dbr_Sentraal-Suid_Koöperasie a dbo_Companybrack_close