It should be clear from my link that the Williams Inst is funded in support of a "Gay and Lesbian academic programme", that is why I printed the link in the first place.

Why should an organisation which supports a "Gay and Lesbian programme", print DUBIOUS statistics against homosexual marriage take-up.....That proves to me my figures are correct, I would not be able to say the same about the figures quoted immediately above this post.
For a start, the Scandinavian figures are over a twenty year period as opposed to a much shorter period in the Californian figures.
Also my article states that when homosexual unions are first introduced, ther is something of a rush....this soon tails off and drops dramatically as time progresses.