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Research conducted in 2004 by Gunnar Anderson, a professor of demography at Sweden’s Stockholm University, seems to confirm the trend. Anderson looked at legal partnerships in both Norway and Sweden and found that in Norway, which legalized civil unions in 1993, only 1,300 homosexual couples registered in the first eight years, compared with 190,000 heterosexual marriages; in Sweden, between initial passage in 1995 and a review in 2002, 1,526 legal partnerships were registered, compared with 280,000 heterosexual marriages. In the Netherlands, gay marriage is actually declining in popularity: 2,500 gay couples married in 2001 — the year it was legalized — and that number dropped to 1,800 in 2002, 1,200 in 2004, and 1,100 in 2005. In 2009, the last year for which figures are available, less than 2 percent of marriages in the Netherlands were between same-sex couples....
Denmark was the first country to introduce recognition of same-sex partnerships, coining the term “registered partnership” in 1989. Norway followed suit in 1993, and then Sweden in 1995. Again, Stockholm University’s study seems to confirm the American trend. In Norway, male same-sex marriages are 50 percent more likely to end in divorce than heterosexual marriages, and female same-sex marriages are an astonishing 167 percent more likely to be dissolved. In Sweden, the divorce risk for male-male partnerships is 50 percent higher than for heterosexual marriages, and the divorce risk for female partnerships is nearly double that for men....