SELECT T2.name ,  T2.open_year FROM membership_register_branch AS T1 JOIN branch AS T2 ON T1.branch_id  =  T2.branch_id WHERE T1.register_year  =  2016 GROUP BY T2.branch_id ORDER BY count(*) DESC LIMIT 1
What is the name and open year for the branch with most number of memberships registered in 2016?
[Schema (values) (types)]: | shop_membership |  member : member_id (text) , card_number (number) , name (text) , hometown (text) , level (text) | branch : branch_id (text) , name (number) , open_year (text) , address_road (text) , city (text) , membership_amount (number) | membership_register_branch : member_id (text) , branch_id (number) , register_year (text) | purchase : member_id (text) , branch_id (number) , year (text) , total_pounds (text);