SINGAPORE - Prime Minister Lee Hsien Loong announced significant changes to the Central Provident Fund (CPF) at his annual National Day Rally on Aug 17. He also paid tribute to Singapore's pioneers, including the country's first President, the late Yusof Ishak.

The Straits Times looks back at the key themes in Mr Lee's National Day Rally speeches over the years and which topics he focused on each year in this interactive graphic.