title: Convert yearly timeseries to monthly
body: <p>How can I convert a yearly timeseries into monthly, if my df index have '01-01-2000','01-01-2001','01-01-2002' and so on. The resample method with 'M' works but the monthly series stops at '01-01' of the last year but I would like to have '12-01' of the last year in the range. Appreciate any help.</p>