| http://www.w3.org/ns/prov#value | - These expenditures amounted to $18 million in 2012 and $13 million in each of 2011 and 2010.SUSTAINABILITYThe adoption of green building codes and standards such as the Leadership in Energy and Environmental Design, or LEED, rating system established by the U.S. Green Building Council to encourage the design and construction of buildings that are environmentally friendly, combined with an increase
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