Bureau Of Labor Statistics (www.bls.gov) website
has a cpi inflation calculator under the heading Inflation & Prices. You can enter dates and it calculates the dollars debasement rate. Here is one result from the calculator—-

1913 — $1.00

is the equivalent of

2008 — $22.10

Perhaps the money supply contraction and expansion we experience are the shorter term result of Central Bank monetary policies, on the path of persistent loss of purchasing power.