Maybe I am being cynical (obviously we have no way of knowing which way they voted), but the number of spoiled papers works out not far off the actual difference between the votes on both sides.
Official result. 3,623,344 voted. Yes 1,617,989. No 2,001,926. Rejected ballots 3429.
edit: my early morning stupor obviously can't do maths...
RE: Anything and Everything
'Illegitimis non carborundum'