how many company were founded in the same year as devonport high school for boys ?
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_Devonport_High_School_for_Boys dbo_foundingYear var_year sep_dot dbr_Devonport_High_School_for_Boys a dbo_Companybrack_close