lakes), and 0.11% is other unproductive land. It is built above the eastern shore of Lake Sempach, and about by road north of the Sempach railway station ( N.W. of Lucerne) on the main line between Lucerne and Olten. Steinibühlweiher is located above the town. Demographics Sempach has a population () of . , 7.9% of the population are resident foreign nationals. Over the last 4 years (2010-2014) the population has changed at a rate of 3.52%. The birth rate in the municipality, in 2014, was 12.3, while the death rate was 5.0 per thousand residents. , children and teenagers (0–19 years old) make up 24.6% of the population, while adults (20–64 years old) are 61.0% and seniors (over 64 years old) make up 14.4%. In 2015 there were 1,896 single residents, 1,904 people who were married or in a civil partnership, 149 widows or widowers and 210 divorced residents. In 2014 there were 1,598 private households in Sempach with an average household size of 2.58persons. Of the 635 inhabited buildings in the municipality, in 2000, about 58.0% were single family homes and 18.3% were multiple family buildings. Additionally, about 14.0% of the buildings were built before 1919, while 21.4% were built between 1991 and 2000. In 2013 the rate of construction of new housing units per 1000 residents was 5.78. The vacancy rate for the municipality, , was 0.64%. there were 615 inhabited buildings in the municipality, of which 474 were built only as housing, and 141 were mixed use buildings. There were 358 single family homes, 44 double family homes, and 72 multi-family homes in the municipality. Most homes were either two (248) or three (163) story structures. There were only 16 single story buildings and 47 four or more story buildings. Most of the population () speaks German (93.8%), with Albanian being second most common (2.2%) and Spanish being third (0.7%). Historic population The historical population is given in the following chart: Economy , there were a total of 1,878 people employed in the municipality. Of these, a total of 137 people worked in 32 businesses in the primary economic sector. The secondary sector employed 650 workers in 55 separate businesses. Finally, the tertiary sector provided 1,091 jobs in 238 businesses. In 2014 a total of 5.8% of the population received social assistance. Politics In the 2015 federal election the most popular party was the CVP with