The economy of Tibet is dominated by subsistence agriculture. Due to limited arable land, livestock raising is the primary occupation mainly on the Tibetan Plateau, among them are sheep, cattle, goats, camels, yaks, donkeys and horses. The main crops grown are barley, wheat, buckwheat, rye, potatoes, oats, rapeseeds, cotton and assorted fruits and vegetables. In recent years the economy has begun evolving into a multiple structure with agriculture and tertiary industry developing side by side. Growth From the 1951 Seventeen Point Agreement to 2003, life expectancy in Tibet increased from thirty-six years to sixty-seven years with infant mortality and absolute poverty declining steadily. Professor Lin Chun summarizes, "Roads, factories, schools, hospitals, and above all, modern conceptions of equality and citizenship, however undemocratic they might be, had transformed the land of snows where the cruelty and hardship of an ancient serfdom had been evident." Tibet's GDP in 2008 was 39.6 billion renminbi yuan. The Chinese government says that it exempts Tibet from all taxation and provides 90% of Tibet's government expenditure. Critics say that the central government in Beijing are stripping Tibetan resources and neglecting the welfare of Tibetan people. According to the Chairman of the Tibet Autonomous Region, Qiangba Puncog, Tibet's economy has grown on average 12% per year from 2000 to 2006. The per capita GDP reached 10,000 RMB in 2006 for the first time in Tibet's history. In the first six months of 2008, economic growth in Tibet was halved after the Lhasa riots led to a slump in tourism, consumption and output. The region’s economy expanded 7.4 percent in the period from 2007, down from 14.7 percent in the year-earlier period. Chinese development efforts The Chinese government allocates yearly economic and financial aid packages to the Tibet Autonomous Region, an amount that academic Lin Chun of the London School of Economics and Political Science characterizes as "enormous." China's most recent Five Year Plan includes nearly USD $30 billion in Tibetan transportation infrastructure funding. From January 18–20, 2010 a national conference on Tibet and areas inhabited by Tibetans in Sichuan, Yunnan, Gansu and Qinghai was held in China and a substantial plan to improve development of the areas was announced. The conference was attended by CPC Politburo Standing Committee members: Hu Jintao, Wu Bangguo, Wen Jiabao, Jia Qinglin, Li Changchun, Xi Jinping, Li Keqiang, He Guoqiang and Zhou Yongkang signaling the commitment of senior Chinese leaders to development