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China-Europe freight trains have made 14,691 trips since March 2011 when they started, said Xiao Weiming with the Office of the Leading Group for Promoting the Belt and Road Initiative.

China-Tajikistan relations have maintained sound development momentum since the two countries established diplomatic ties 27 years ago, Xi said, noting that they have become good neighbors, friends and partners and the bilateral relations are at their best in history.

China's total fertility rate, a key population index, declined gradually after 1990, the year when the rate reached 2.1, the minimum level to ensure China's population will not shrink, Zhang said. The rate has generally remained between 1.5 and 1.6 since 2000, indicating a serious lack of births, he said.

China-CEEC cooperation, also known as the "16+1" mechanism, is beneficial to promoting development of China and the 16 CEE nations, shrinking disparity inside members of the European Union for more balanced development and will push forward European integration, Li said.

China's urban population accounted for 60.6 percent of the total population at the end of last year, and Chi said it is expected to hit 66 percent by 2025 through increased urbanization and development of city clusters.