enr's construction cost index history (1908-2011) year jan feb mar apr may jun jul aug sep oct nov dec avg (9172 - 8952) / 8952 = 2.5% 2011 8938 8998 9011 9027 9035 9053 9080 9088 9116 9147 9173 2010 8660 8672 8671 8677 8761 8805 8865 8858 8836 8921 8951 8952 802 2009 8549 8533 8534 8528 8574 8578 8566 8564 8586 8596 8592 8641 8570
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