PNC Bank Inc., which has its headquarters in Pittsburgh, reported $17,446 (million) in commercial loans in 1995, $19,989 in 1997, $21,468 in 1999, $21,685 in 2000, $15,922 in 2002, $18,375 in 2004, $54,818 in 2009, and $83,040 in 2012. Using 1995 as the base, develop a simple index of commercial loans for the years 2002, 2004, 2009, and 2012.