Germany officially named "Deutschland" is a fifth largest, federal republic in central Europe with three city states and thirteen regions. Germany offers high levels of employments while men are primarily in full-time work and women works part-time with minimum wages. Germany is the most populous country in the European Union, the second most populous country in Europe after Russia, and ranks as the 16th most populous country in the world. Germany has the world's oldest universal health care system. In 2015 Michelin Guide awarded eleven restaurants in Germany three stars, the highest designation, while 38 more received two stars and 233 one star. German restaurants have become the world's second-most decorated after France. Germany is well known for its diverse tourist routes connected with town. Germany is a global leader in science and technology as its achievements in the fields of science and technology have been significant. The German energy transition is the recognised move to a sustainable economy by means of energy efficiency and renewable energy. Germany is recognised for its large portion of specialised small and medium enterprises, known as the Mittelstand model. More than 1,000 of these companies are global market leaders in their segment and are labelled hidden champions in Berlin