Question: kindly you can only do : Part 1: (a) and (b)-(3)&(4) Part 2: other than the data link provided, you may find the following links

kindly you can only do :
Part 1: (a) and (b)-(3)&(4)
Part 2: other than the data link provided, you may find the following links would be more convenient and straightforward
-----for forecast: http://www.forecasts.org/data/gdp-data.htm
-----for NIIP: https://fred.stlouisfed.org/categories/33705
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