Shown are Statistics New Zealand quarterly data for the total number of people employed in New Zealand for the period March 2016 to December 2019. Calculate seasonal indices for the data. Deseasonalise the data and plot a graph of the original series and the deseasonalised series. Comment on your results.

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People employed ('000s) Period 2170.6 Mar. 16 Jun. 16 2165.6 Sept. 16 2181.9 Dec. 16 2203.0 Mar. 17 2209.9 June 17 2208.3 Sept. 17 2206.5 Dec. 17 2237.0 Mar. 18 2230.9 June 18 2220.4 2208.1 Sept. 18 2205.1 Dec. 18 Mar. 19 2239.8 June 19 2236.5 2261.8 Sept. 19 Dec. 19 2311.2