human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Year, Theme, Face Value, Weight, Diameter, Mintage, Issue Price
###Question: What is the Year of the Coin with an Issue Price of $1089.95 and Mintage less than 900?
gpt
SELECT SUM Year FROM table WHERE Issue Price = $1089.95 AND Mintage < 900