In 1972, Jigme Singye Wangchuck ascended the throne at age 16. He emphasized modern education, decentralization of governance, the development of hydroelectricity and tourism and improvements in rural developments. He was perhaps best known internationally for his overarching development philosophy of "gross national happiness." It recognizes that there are many dimensions to development and that economic goals alone are not sufficient. Satisfied with Bhutan's transitioning democratization process, he abdicated in December 2006 rather than wait until the promulgation of the new constitution in 2008. His son, Jigme Khesar Namgyel Wangchuck, became King upon his abdication.