A welfare organization has been receiving donations from benefactors over the years. The data is stored in the following tables:

TABLE benefactors

id INTEGER PRIMARY KEY

name VARCHAR$(50)$ NOT NULL

TABLE donations

id INTEGER PRIMARY KEY

amount INTEGER NOT NULL

year INTEGER NOT NULL

benefactorId INTEGER

FOREIGN KEY $($benefactorId$)$ REFERENCES

benefactors$($id$)$

Some donations are received from anonymous sources $($benefactorld is null$).$

Write a query that returns:

Benefactor names.

Sum of their contributions for the year $2015.$

Benefactors who haven't been able to contribute in the year $2015,$ should also be returned with their contribution as $0.$ All anonymous contributions should be summed under the name 'Anonymous'. If there are no anonymous contributions for the year $2015,$ no rows with the name 'Anonymous' should be returned.

See the example case for more details.