The story is summarized here, which points out the data is post-2009 but does not yet include statistics for 2012:
In 2009, the ELCA lost 90,850 members (14,781 more than the year previous). Keep in mind that Churchwide Assembly [allowing ordination of homosexuals and lesbians] happened late in 2009. By 2010, the membership losses were more dramatic, with the ELCA losing 270,349 people that year (5.9% of the entire church at that time). In 2011, they lost another 212,903 (4.98% of the entire church at that time). Statistics on 2012 are not yet reported online.
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-- Numbers 16:20f.