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Answer
Computation of trend values
| Year | Production (Thousand tonnes) | 3 - yearly moving totals | 3 - yearly moving averages$Y_c$ | Short term fluctuations $\left( Y - Y _{ c }\right)$ |
| 2008 | 21 | - | - | - |
| 2009 | 22 | 66 | 22 | 0 |
| 2010 | 23 | 70 | 23.33 | -0.33 |
| 2011 | 25 | 72 | 24 | 1 |
| 2012 | 24 | 71 | 23.67 | 0.33 |
| 2013 | 22 | 71 | 23.67 | -1.67 |
| 2014 | 25 | 73 | 24.33 | 0.67 |
| 2015 | 26 | 78 | 26 | 0 |
| 2016 | 27 | 79 | - | 0.67 |
| 2017 | 26 | - | - | - |
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