effectiveness. We make our products in focused factories and product cells. We source raw materials and components from suppliers around the world.
For all segments, we primarily sell our equipment through third party distributors worldwide, positioned throughout our geographic regions, and through selected retailers. Our products are sold from our warehouse to our third party distributors or retailers who sell our products to end-users. Certain of our acquired businesses historically sold their products directly to end-user customers and continue to have direct relationships with customers.
Outside of the United States, our subsidiaries located in Australia, Belgium, Japan, Italy, Korea, the P.R.C., Singapore and the United Kingdom distribute our Company’s products. Operations in Maasmechelen, Belgium; St. Gallen, Switzerland; Shanghai, P.R.C.; and Montevideo, Uruguay reinforce our commitment to their regions.
During 2015, manufacturing capacity met business demand. Production requirements in the immediate future are expected to be met through existing facilities, the installation of new automatic and semi-automatic machine tools, efficiency and productivity improvements, the use of leased space and available subcontract services. We are evaluating alternatives to expand existing facilities by acquiring or leasing future additional space for our Contractor segment, which is nearing capacity at its existing facility in Rogers, Minnesota. For more details on our facilities, see Item 2, Properties.
Our primary product development efforts are carried out in facilities located in Minneapolis, Anoka and Rogers, Minnesota; North Canton, Ohio; St. Gallen, Switzerland; Suzhou, P.R.C.; Dexter, Michigan; Erie, Pennsylvania; Kamas, Utah; and Brighouse, United Kingdom. The product development and engineering groups focus on new product design, product improvements, new applications for existing products and technologies for their specific customer base. Our product development efforts focus on bringing new and supplemental return on investment value to end users of our products.
Our Company consistently makes significant investments in new products. Total product development expenditures for all segments were $59 million in 2015, $54 million in 2014 and $51 million in 2013. The amounts invested in product development represented approximately 4½ percent of sales in each of the last three years. Our product development activities are focused both on upgrades to our current product lines to provide features and benefits that will provide a return on investment to our end-user customers and development of products that will reach into new industries and applications to incrementally grow our sales. Sales of products that refresh and upgrade our product lines are measured and compared with actual results. Sales of products that provide entry into new industries and applications are also measured, with additional focus on commercial resources and activities to build specialized third party distribution and market acceptance by end users.
Our Company measures the results of acquired businesses as compared to historical results and projections made at the time of acquisition. Our Company will invest in engineering, manufacturing and commercial resources for these businesses based on expected return on investment.
The Industrial segment is our largest segment and represents approximately 48 percent of our total sales in 2015. It includes the Industrial Products and Applied Fluid Technologies divisions. The Industrial segment markets equipment and pre-engineered packages for moving and applying paints, coatings, sealants, adhesives and other fluids. Markets serviced include automotive and vehicle assembly and components production, wood and metal products, rail, marine, aerospace, farm, construction, bus, recreational vehicles and various other industries.
Most Industrial segment equipment is sold worldwide through specialized third party distributors, integrators, design centers, original equipment manufacturers and material suppliers. Some products are sold directly to end users. We work with material suppliers to develop or adapt our equipment for use with specialized or hard-to-handle materials. Distributors promote and sell the equipment, hold inventory, provide product application expertise and offer on-site service, technical support and integration capabilities. Integrators implement large individual installations in manufacturing plants where products and services from a number of different manufacturers are aggregated into a single system. Design centers engineer systems for their customers using our products. Original equipment manufacturers incorporate our Company’s Industrial segment products into systems and assemblies that they then supply to their customers.