If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values,

1. what coded value do you assign to X for the first year in the series?

2. what coded value do you assign to X for the fifth year in the series?

3. what coded value do you assign to X for the most recent recorded year in the series?

4. what coded value do you assign to X if you want to project the trend and make a forecast five years beyond the last observed value? Explain.