14. Refer to the following information from Mohawk Industries, Inc.

Property, Plant, and Equipment

Following is a summary of property, plant, and equipment:

	Dec. 31, 2015	Dec. 31, 2014
Buildings and improvements	1,426,136	1,271,964
Machinery and equipment	3,750,787	3,324,657
Furniture, fixtures, and miscellaneous	606,334	533,592
	5,78,257	5,130,213
Accumulated depreciation	2,636,139	2,427,003
Net property, plant, and equipment	3,147,118	2,703,210

Depreciation expense was $328,486, $315,840, and $276,432 for 2015, 2014, and 3013 respectively.

Estimate the average useful life that Mohawk is using for its property, plant, and equipment for 2015.