4.8% who are between 80 and 89, and there are 2 people or 0.8% who are 90 and older. , there were 96 people who were single and never married in the municipality. There were 109 married individuals, 20 widows or widowers and 7 individuals who are divorced. , there were 86 private households in the municipality, and an average of 2.5 persons per household. There were 23 households that consist of only one person and 7 households with five or more people. Out of a total of 88 households that answered this question, 26.1% were households made up of just one person and there were 3 adults who lived with their parents. Of the rest of the households, there are 22 married couples without children, 33 married couples with children There was one single parent with a child or children. There were 4 households that were made up of unrelated people and 2 households that were made up of some sort of institution or another collective housing. there were 43 single family homes (or 53.1% of the total) out of a total of 81 inhabited buildings. There were 4 multi-family buildings (4.9%), along with 28 multi-purpose buildings that were mostly used for housing (34.6%) and 6 other use buildings (commercial or industrial) that also had some housing (7.4%). , a total of 83 apartments (87.4% of the total) were permanently occupied, while 9 apartments (9.5%) were seasonally occupied and 3 apartments (3.2%) were empty. , the construction rate of new housing units was 0 new units per 1000 residents. The vacancy rate for the municipality, , was 0%. The historical population is given in the following chart: Sights The entire village of Trey is designated as part of the Inventory of Swiss Heritage Sites. Politics In the 2007 federal election the most popular party was the FDP which received 34.15% of the vote. The next three most popular parties were the SVP (30.75%), the SP (20.08%) and the Green Party (7.57%). In the federal election, a total of 96 votes were cast, and the voter turnout was 58.5%. Economy , Trey had an unemployment rate of 2.3%. , there were 60 people employed in the primary economic sector and about 13 businesses involved in this sector. 4 people were employed in the secondary sector and there was 1 business in this sector. 10 people were employed in the tertiary