here the function you request:

P = e^(((days from 01/01/2012) * 0.0067) + 1.641))

example: price at 31/12/2014 =

days  from 01/01/2012 to 31/12/2014 = 366 + 365 + 365 = 1096

P = e^((1096*0.0067)  + 1.641) =  7976.06132258175

This can be a "good" price for bitcoin  at end 2014
IF MY ANALYSIS CONTINUES TO WORK OVER THE TIME !!!!