US flate rate...guvt hav reesunabel numbers starting in 1800
B4 that...tri googel tu get sumwon's ges
US guvt data giv numbr=51 for yeer=1800
this is based on yeer1967=100
yeer 2012=718.699
718.699/51=14.09213...1 dollar in 1800 inflated tu 14 $ now
=212 yeers
so (1+x)^212=14.09213
take logs...212*log(1+x)=log(14.09213)=1.148976641
log(1+x)=1.148976641/21 =0.005419701136
1+x=10^0.005419701136
=1.0125575
so averaej flate rate from 1800 thru 2012=1.256%/yeer
resent...average from 2000 thru 2012=2.8%/yeer