text: The quantitative amount of**other non-standard types of work**often is not well statistically monitored 
  but based on estimates. There are several difficulties to generate reliable statistical data: many of these 
  types of work are less regular, they can be below the level of notification obligations or fully undeclared, 
  obligations for statistical notification are not issued or not followed, and/or these types of work are done 
  in parallel together with other forms of work or income. The OECD estimates that the group with the 
  highest share of these types of work are pensioners who perform such work as a second job. 67 
  
  A special case of contract types are**posted and seasonal workers**68 in the EU. Their numbers have 
  been estimated, for example, in annual reports on ‘Labour mobility’.69 
  
  **Table 8: Posted and seasonal workers – Eurostat**
  
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              [html]<thead><tr><td>Wordford force structure – mobility, migration</td><td>Latest possible data</td></tr></thead><tbody><tr><td>Posted workers70</td><td>2.37 m, approx, 1.2 % ( 2020, EU - 27 )</td></tr><tr><td>Intra - EU seasonal workers ’ 1</td><td>Between 0.65 m and 0.85 m ( 2019, EU - 27 )</td></tr></tbody>
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