There is a contributor on Octane.ie with archival material from the SIMI (Society Irish Motor Industry) and he has some interesting data to share.
For example he has been able to state how many Fiat 131s were ever registered in Ireland up to 1983 namely:
17,964 Where did they all go...?
He has also been able to give a breakdown by year but not unfortunately by model - I'd love to know how many Sports were registered! Anyway here is the breakdown:
1975 470
1976 1912
1977 3831
1978 3634
1979 1806
1980 1848
1981 2310
1982 340
1983 289
Which does not tally exactly with the total above...but it looks like it might be about right.
Interesting that the peak was during the S1, maintained by the change to S2 and revived again at S3. Severe drops afterwards though....
For comparison purposes there were:
2,087 x 132s
10,263 x Ritmos
47 x 130s
376 x 125s (including Polski 125s)
3,237 x 124s
11,872 x 128s
28,058 x 127s
2,074 x 126s
1,786 x Pandas
218 x Argentas