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How many working days in year 1991?
Here is the detail of the calculation:
Because 1991 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1991.
 Here is the list of these 8 public holidays: 
 
 1. Año Nuevo : Tuesday, 1 January, 1991 
2. Día de la Constitución : Monday, 4 February, 1991 
3. Natalicio de Benito Juárez : Monday, 18 March, 1991 
4. Viernes Santo : Friday, 29 March, 1991 
5. Día del Trabajo : Wednesday, 1 May, 1991 
6. Día de la Independencia : Monday, 16 September, 1991 
7. Día de la Revolución : Monday, 18 November, 1991 
8. Navidad : Wednesday, 25 December, 1991