How many % same-sex marriages are marriages between men for 923? 
CREATE TABLE "marriage_statistics" (
  "year" text,
  "marriages_between_men" real,
  "marriages_between_women" real,
  "same_sex_marriages" real,
  "total_marriages" real,
  "pct_same_sex_marriages" text
);
SELECT COUNT("pct_same_sex_marriages") FROM "marriage_statistics" WHERE "marriages_between_men"=923;