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How many working days in year 2016?
Here is the detail of the calculation:
Because 2016 is a leap year, it has 366 days.
Let's remove 53 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 252 working days in 2016.
 Here is the list of these 9 public holidays: 
 
 1. Neijoerschdag : Friday, 1 January, 2016 
2. Karfreideg : Friday, 25 March, 2016 
3. Ouschterméindeg : Monday, 28 March, 2016 
4. Christi Himmelfaart : Thursday, 5 May, 2016 
5. Péngschtméindeg : Monday, 16 May, 2016 
6. Nationalfeierdag : Thursday, 23 June, 2016 
7. Léiffrawëschdag : Monday, 15 August, 2016 
8. Allerhellegen : Tuesday, 1 November, 2016 
9. Stiefesdag : Monday, 26 December, 2016 
And here are the 3 public holidays falling on a weekend:
1. Dag vun der Aarbecht : Sunday, 1 May, 2016 
2. Hellegowend : Saturday, 24 December, 2016 
3. Chrëschtdag : Sunday, 25 December, 2016