HONG KONG (Reuters) – Hong Kong returned to China in 1997 after 156 years of British colonial rule. Here are some major transformations the financial hub has witnessed during the past 25 years. OUTSHINED BY MAINLAND CHINA While Hong Kong retains an outsized, indirect contribution to China’s economic growth given its status as the only Chinese financial centre not subject to capital controls, its own growth has been overshadowed by that of the mainland. Interactive graphic: Hong Kong’s GDP as a percentage of China’s GDP: https://graphics.reuters.com/HONGKONG-ANNIVERSARY/klpykrbebpg/index.html G…