old) make up 20.8% of the population, while adults (20–64 years old) make up 61.8% and seniors (over 64 years old) make up 17.4%. , there were 15,582 people who were single and never married in the municipality. There were 17,687 married individuals, 2,306 widows or widowers and 2,207 individuals who are divorced. , there were 17,240 private households in the municipality, and an average of 2.1 persons per household. There were 6,657 households that consist of only one person and 700 households with five or more people. , a total of 16,917 apartments (92.4% of the total) were permanently occupied, while 1,096 apartments (6.0%) were seasonally occupied and 305 apartments (1.7%) were empty. , the construction rate of new housing units was 4.7 new units per 1000 residents. The vacancy rate for the municipality, , was 0.75%. The historical population is given in the following chart: Heritage sites of national significance The farm house at Herzwilstrasse 175, the Roman Era farmhouse at Chly-Wabere, the former commandry with castle, church and outbuildings, the Herrenstock, Hof Burren at Mengestorfbergstrasse 191, 193, the noble's wooden house and Villa Morillon are listed as Swiss heritage sites of national significance. The hamlets of Gurtendörfli, Herzwil, Liebewil and Mengestorf are all part of the Inventory of Swiss Heritage Sites. Politics In the 2007 federal election the most popular party was the SVP which received 25.21% of the vote. The next three most popular parties were the SPS (24.07%), the FDP (16.56%) and the Green Party (14.76%). In the federal election, a total of 13,424 votes were cast, and the voter turnout was 49.8%. Economy , Köniz had an unemployment rate of 3.1%. , there were 473 people employed in the primary economic sector and about 157 businesses involved in this sector. 3,985 people were employed in the secondary sector and there were 250 businesses in this sector. 14,713 people were employed in the tertiary sector, with 1,015 businesses in this sector. the total number of full-time equivalent jobs was 15,322. The number of jobs in the primary sector was 308, all of which were in agriculture. The number of jobs in the secondary sector was 3,745 of which 2,413 or (64.4%) were in manufacturing, 16 or (0.4%) were in mining and 1,210 (32.3%) were in construction. The number of jobs in the tertiary sector was 11,269. In the tertiary sector; 2,021 or 17.9% were in