couples earned a pretax average of $165,960 per year, while lesbian couples earned $118,415 and straight couples earned $115,210. The highest rates of female same-sex marriage were found in Oakland (2.1% of all marriages), Seattle, San Francisco, Springfield (MA) and Portland (OR), whereas gay male marriages were most frequent in San Francisco (3.2%), Washington D.C., New York City, Seattle and Fort Lauderdale. The United States Census Bureau has collected data on unmarried same-sex households since 2005. Since 2013 following United States v. Windsor, the Bureau began recording married same-sex households in its Same-Sex Couples report. It recorded about 252,000 same-sex spouses in 2013; 335,000 in 2014; 425,000 in 2015; 487,000 in 2016; 555,000 in 2017; 593,000 in 2018. In 2018, the states of California, Texas and New York had the highest total number of same-sex households, whereas Wyoming, Vermont, South Dakota and Connecticut had the most married same-sex households in comparison to unmarried households (92.4% of Wyoming same-sex households were married, followed by Vermont at 79.3%, South Dakota at 77.8% and Connecticut at 70.7%). Nationally, 59.5% of cohabiting same-sex couples were married. The Population Reference Bureau reported that by October 2015 approximately 486,000 same-sex marriages had taken place in the United States. It estimated that 45% of all same-sex couples in the country were married at that time. According to Gallup, the percent of cohabiting same-sex couples who are married rose from 38% in 2015 to 49% in 2016 and to 61% in 2017. Case law United States federal and state case law regarding same-sex marriage: 1970s Anonymous v. Anonymous, 67 Misc.2d 982 (N.Y. 1971). The law makes no provision for a "marriage" between persons of the same sex. Baker v. Nelson, 191 N.W.2d 185 (Minn. 1971). Upholds a Minnesota law defining marriage as the union of a man and a woman. (Overruled by Obergefell v. Hodges in 2015; see below) Jones v. Hallahan, 501 S.W.2d 588 (Ky. 1973). Upholds the denial of a marriage license to two women in Kentucky based on dictionary definitions of marriage, despite the fact that state statutes do not specify the gender of marriage partners. Frances B. v. Mark B., 78 Misc.2d 112 (1974). Marriage is and always has been a contract between a man and a woman. Singer v. Hara, 522 P.2d 1187 (Wash. Ct. App. 1974). The historical definition of marriage is between one man and one woman, and same-sex couples are