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How many working days in year 1989?
Here is the detail of the calculation:
Because 1989 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 252 working days in 1989.
 Here is the list of these 8 public holidays: 
 
 1. Loppiainen : Friday, 6 January, 1989 
2. Pitkäperjantai : Friday, 24 March, 1989 
3. 2. pääsiäispäivä : Monday, 27 March, 1989 
4. Vappu : Monday, 1 May, 1989 
5. Helatorstai : Thursday, 4 May, 1989 
6. Itsenäisyyspäivä : Wednesday, 6 December, 1989 
7. Joulupäivä : Monday, 25 December, 1989 
8. Tapaninpäivä : Tuesday, 26 December, 1989 
And here are the 5 public holidays falling on a weekend:
1. Uudenvuodenpäivä : Sunday, 1 January, 1989 
2. Pääsiäispäivä : Sunday, 26 March, 1989 
3. Helluntaipäivä : Sunday, 14 May, 1989 
4. Juhannuspäivä : Saturday, 24 June, 1989 
5. Pyhäinpäivä : Saturday, 4 November, 1989