▁single ▁family ▁homes ▁( or ▁ 6 4 . 7 % ▁of ▁the ▁total ) ▁out ▁of ▁a ▁total ▁of ▁ 1 1 6 ▁homes ▁and ▁apart ments . ▁ ▁There ▁were ▁a ▁total ▁of ▁ 2 ▁empty ▁apart ments ▁for ▁a ▁ 1 . 7 % ▁vac ancy ▁rate . ▁ ▁, ▁the ▁construction ▁rate ▁of ▁new ▁housing ▁units ▁was ▁ 6 . 4 ▁new ▁units ▁per ▁ 1 0 0 0 ▁residents . ▁ ▁In ▁the ▁ 2 0 0 7 ▁federal ▁election ▁the ▁most ▁popular ▁party ▁was ▁the ▁SV P ▁which ▁received ▁ 4 7 . 1 % ▁of ▁the ▁vote . ▁ ▁The ▁next ▁three ▁most ▁popular ▁parties ▁were ▁the ▁C VP ▁( 1 8 . 7 % ), ▁the ▁SP ▁( 1 0 %) ▁and ▁the ▁Green ▁Party ▁( 8 . 4 %). ▁ ▁The ▁historical ▁population ▁is ▁given ▁in ▁the ▁following ▁table : ▁ ▁Heritage ▁sites ▁of ▁national ▁significance ▁The ▁farm ▁house ▁at ▁Un tern iesen berg ▁ 4 5 ▁is ▁listed ▁as ▁a ▁Swiss ▁her itage ▁site ▁of ▁national ▁significance . ▁ ▁Econom y ▁, ▁K all ern ▁had ▁an ▁un emp loyment ▁rate ▁of ▁ 2 . 1 1 %. ▁ ▁, ▁there ▁were ▁ 4 8 ▁people ▁employed ▁in ▁the ▁primary ▁economic ▁sector ▁and ▁about ▁ 1 8 ▁business es ▁involved ▁in ▁this ▁sector . ▁▁ 8 ▁people ▁are ▁employed ▁in ▁the ▁secondary ▁sector ▁and ▁there ▁are ▁ 5 ▁business es ▁in ▁this ▁sector . ▁▁ 3 5 ▁people ▁are ▁employed ▁in ▁the ▁t