, the construction rate of new housing units was 2.2 new units per 1000 residents. the average price to rent a two-room apartment was about 800.00 CHF (US$640, £360, €510), a three-room apartment was about 1028.00 CHF (US$820, £460, €660) and a four-room apartment cost an average of 1217.00 CHF (US$970, £550, €780). The vacancy rate for the municipality, , was 0.31%. The historical population is given in the following chart: Heritage sites of national significance The Au-Hard (Part of the late-Roman era Rhine fortifications), the Freidorf settlement, the Rangierbahnhof (Train Station) and the Reformed Parish Fortified Church of St. Arbogast are listed as Swiss heritage site of national significance. The entire village of Muttenz and the cemetery with surrounding settlements are both listed in the Inventory of Swiss Heritage Sites. Wartenberg Built in the Middle Ages, the three fortresses built on the Wartenberg were heavily damaged in the earthquake of 1356, rebuilt in the following decades and later abandoned. They were partially restored in 1955/56. St. Arbogast The fortified church of St. Arbogast, serving the local evangelical community, was built in the late Middle Ages. Its surrounding seven metre tall ramparts built in the 15th century are still intact. A charnal house was built adjoining the church in the 15th century. Wall paintings made in 1513 were painted over following the Protestant Reformation, but were restored during a complete renovation in the 1970s. Muttenz was awarded the Wakker Prize for architectural preservation by the Swiss Heritage Society in 1983. The church is listed as a heritage site of national significance, as is the medieval village core. Freidorf Freidorf is a communal housing estate with 150 buildings built in 1920 by Hannes Meyer (1889–1954), a Bauhaus-affiliated architect. It is also listed as a heritage site of national significance. Politics In the 2007 federal election the most popular party was the SP which received 30.59% of the vote. The next three most popular parties were the SVP (27.32%), the FDP (13.79%) and the Green Party (12.37%). In the federal election, a total of 5,850 votes were cast, and the voter turnout was 49.0%. Economy , Muttenz had an unemployment rate of 2.04%. , there were 93 people employed in the primary economic sector and about 22 businesses involved in this sector. 5,170 people were employed in the secondary sector and there were 191 businesses in this sector. 8,902 people were employed