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How many working days in year 1999?
Here is the detail of the calculation:
Because 1999 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1999.
 Here is the list of these 10 public holidays: 
 
 1. Año Nuevo : Friday, 1 January, 1999 
2. Día de los Santos Reyes : Wednesday, 6 January, 1999 
3. Día de Nuestra Señora de la Altagracia : Thursday, 21 January, 1999 
4. Día de Juan Pablo Duarte : Tuesday, 26 January, 1999 
5. Viernes Santo : Friday, 2 April, 1999 
6. Día del Trabajo : Monday, 3 May, 1999 
7. Corpus Christi : Thursday, 3 June, 1999 
8. Día de la Restauración de la República : Monday, 16 August, 1999 
9. Nuestra Señora de las Mercedes : Friday, 24 September, 1999 
10. Día de la Constitución : Monday, 8 November, 1999 
And here are the 2 public holidays falling on a weekend:
1. Día de la Independencia Nacional : Saturday, 27 February, 1999 
2. Navidad : Saturday, 25 December, 1999