this sector. 657 people are employed in the secondary sector and there are 79 businesses in this sector. 1,463 people are employed in the tertiary sector, with 266 businesses in this sector. The historical population is given in the following table: Heritage sites of national significance The Gmündertobel Bridge (shared with Stein, Appenzell), and the Wattbach Bridge (shared with Stein and St. Gallen) are listed as heritage sites of national significance. Weather Teufen has an average of 154.2 days of rain per year and on average receives of precipitation. The wettest month is June during which time Teufen receives an average of of precipitation. During this month there is precipitation for an average of 15.1 days. The month with the most days of precipitation is May, with an average of 15.2, but with only of precipitation. The driest month of the year is February with an average of of precipitation over 15.1 days. Tritium Teufen is home to RC Tritec, a company that provides Tritium and other radioactive isotopes to industry. Until 2008 they provided luminous Tritium compounds for the Swiss watch industry, but they have replaced radioactive Tritium with non-radioactive Super-LumiNova. Tritium emissions are tested every week and monitored by the Federal Government. In 2010 the waste water radiation levels reached a high of 16 GBq, which is still below the 20 GBq limit, due to construction activities. The 2011 waste water readings are only 2GBq. References External links Official Page (German) Official Municipal Newspaper (German) Bilder von Teufen (German) Municipalities of Appenzell Ausserrhoden Cultural property of national significance in Appenzell Ausserrhoden