Historical clue formulations

• Borneo neighbor — 2025-09-07
• Eastern island on the Equator — 2023-05-02
• Island near Krakatoa — 2019-12-06
• Major source of coffee beans — 2019-10-06
• Neighbor of Borneo — 2019-06-18
• Island known for its coffee — 2017-08-18
• Large Indonesian island — 2016-06-13
• Home to many orangutans — 2013-03-05
• Indonesian island crossed by the Equator — 2007-05-30
• Island divided almost in half by the Equator — 2002-12-21
• Island crossed by the Equator — 2002-02-24
• Island across the strait from Singapore — 2001-09-17
• It's across the strait from Singapore — 1995-07-16