PNC Bank Inc., which has its headquarters in Pittsburgh, reported the following commercial loan totals for years 2008 through 2015. Using 2008 as the base, develop a simple index of commercial loans for the following years

Year............................................ Loans ($ Millions)
2008...................................................... 69,220
2009...................................................... 54,818
2010...................................................... 55,177
2011...................................................... 65,694
2012 ......................................................83,040
2013...................................................... 88,378
2014 ......................................................97,420
2015...................................................... 98,608