Study the given table and answer the question that follows.
The given table shows the production of different types of refrigerators in a company.

Years	A	B	C
2011	2018	1800	1932
2012	2040	1890	1800
2013	2035	1910	1890
2014	2020	1940	1978
2015	1997	1960	1900

In which of the given year(s) was the production of B type refrigerator closest to its average production over the given years?