By 23 April 2018, five years after the French Parliament approved the same-sex marriage law, approximately 40,000 same-sex couples had married in the country. This represented about 3.5% of all marriages. Of these, most were celebrated in Paris (9.7% of all marriages), Calvados (department) (5.6%), Charente-Maritime (5.4%), Hérault (5.1%), Orne (4.8%), and Alpes-de-Haute-Provence (4.6%). In contrast, the departments with the least same-sex marriages were Guadeloupe (0.3%), Mayotte (0.6%), Martinique (0.6%), French Guiana (1%), Haute-Corse (1.1%), and Réunion (1.2%).
Question: How many percent did the top three citys have of same sex marriages, combined?
Answer: 20.7