<Tr> <Th_colspan="20"> References: </Th> </Tr> <P> Since 1963, PAGASA has independently operated its own naming scheme for tropical cyclones that occur within its own self - defined Philippine Area of Responsibility . The names are taken from four different lists of 25 names and are assigned when a system moves into or develops into a tropical depression within PAGASA's jurisdiction . The four lists of names are rotated every four years, with the names of significant tropical cyclones retired should they have caused at least ₱ 1 billion in damage and or at least 300 deaths within the Philippines . Should the list of names for a given year be exhausted, names are taken from an auxiliary list, the first ten of which are published every year . </P> <Table> List of Philippine region tropical cyclone names <Tr> <Th_colspan="14"> 2018 </Th> </Tr> <Tr> <Th> Main </Th> <Td> Agaton </Td> <Td> Basyang </Td> <Td> Caloy </Td> <Td> Domeng </Td> <Td> Ester </Td> <Td> Florita </Td> <Td> Gardo </Td> <Td> Henry </Td> <Td> Inday </Td> <Td> Josie </Td> <Td> Karding </Td> <Td> Luis </Td> <Td> Maymay </Td> </Tr> <Tr> <Td> Neneng </Td> <Td> Ompong </Td> <Td> Paeng </Td> <Td> Queenie </Td> <Td> Rosita </Td> <Td> Samuel </Td> <Td> Tomas </Td> <Td> Usman </Td> <Td> Venus </Td> <Td> Waldo </Td> <Td> Yayang </Td> <Td> Zeny </Td> <Td> </Td> </Tr> <Tr> <Th> Auxiliary </Th> <Td> Agila </Td> <Td> Bagwis </Td> <Td> Chito </Td> <Td> Diego </Td> <Td> Elena </Td> <Td> Felino </Td> <Td> Gunding </Td> <Td> Harriet </Td> <Td> Indang </Td> <Td> Jessa </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th_colspan="14"> 2019 </Th> </Tr> <Tr> <Th> Main </Th> <Td> Amang </Td> <Td> Betty </Td> <Td> Chedeng </Td> <Td> Dodong </Td> <Td> Egay </Td> <Td> Falcon </Td> <Td> Goring </Td> <Td> Hanna </Td> <Td> Ineng </Td> <Td> Jenny </Td> <Td> Kabayan </Td> <Td> Liwayway </Td> <Td> Marilyn </Td> </Tr> <Tr> <Td> Nimfa </Td> <Td> Onyok </Td> <Td> Perla </Td> <Td> Quiel </Td> <Td> Ramon </Td> <Td> Sarah </Td> <Td> Tisoy </Td> <Td> Ursula </Td> <Td> Viring </Td> <Td> Weng </Td> <Td> Yoyoy </Td> <Td> Zigzag </Td> <Td> </Td> </Tr> <Tr> <Th> Auxiliary </Th> <Td> Abe </Td> <Td> Berto </Td> <Td> Charo </Td> <Td> Dado </Td> <Td> Estoy </Td> <Td> Felion </Td> <Td> Gening </Td> <Td> Herman </Td> <Td> Irma </Td> <Td> Jaime </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th_colspan="14"> 2020 </Th> </Tr> <Tr> <Th> Main </Th> <Td> Ambo </Td> <Td> Butchoy </Td> <Td> Carina </Td> <Td> Dindo </Td> <Td> Enteng </Td> <Td> Ferdie </Td> <Td> Gener </Td> <Td> Helen </Td> <Td> Igme </Td> <Td> Julian </Td> <Td> Kristine </Td> <Td> Leon </Td> <Td> Marce </Td> </Tr> <Tr> <Td> Nika </Td> <Td> Ofel </Td> <Td> Pepito </Td> <Td> Quinta </Td> <Td> Rolly </Td> <Td> Siony </Td> <Td> Tonyo </Td> <Td> Ulysses </Td> <Td> Vicky </Td> <Td> Warren </Td> <Td> Yoyong </Td> <Td> Zosimo </Td> <Td> </Td> </Tr> <Tr> <Th> Auxiliary </Th> <Td> Alakdan </Td> <Td> Baldo </Td> <Td> Clara </Td> <Td> Dencio </Td> <Td> Estong </Td> <Td> Felipe </Td> <Td> Gomer </Td> <Td> Heling </Td> <Td> Ismael </Td> <Td> Julio </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th_colspan="14"> 2021 </Th> </Tr> <Tr> <Th> Main </Th> <Td> Auring </Td> <Td> Bising </Td> <Td> Crising </Td> <Td> Dante </Td> <Td> Emong </Td> <Td> Fabian </Td> <Td> Gorio </Td> <Td> Huaning </Td> <Td> Isang </Td> <Td> Jolina </Td> <Td> Kiko </Td> <Td> Lannie </Td> <Td> Maring </Td> </Tr> <Tr> <Td> Nando </Td> <Td> Odette </Td> <Td> Paolo </Td> <Td> Quedan </Td> <Td> Ramil </Td> <Td> Salome </Td> <Td> Tino </Td> <Td> Urduja </Td> <Td> Vinta </Td> <Td> Wilma </Td> <Td> Yasmin </Td> <Td> Zoraida </Td> <Td> </Td> </Tr> <Tr> <Th> Auxiliary </Th> <Td> Alamid </Td> <Td> Bruno </Td> <Td> Conching </Td> <Td> Dolor </Td> <Td> Ernie </Td> <Td> Florante </Td> <Td> Gerardo </Td> <Td> Hernan </Td> <Td> Isko </Td> <Td> Jerome </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th_colspan="20"> References: </Th> </Tr> </Table> <Tr> <Th_colspan="14"> 2018 </Th> </Tr>

When did the naming of storms begin and how