<Tr> <Td> San Marino </Td> <Td> Captains Regent </Td> <Td> Stefano Palmieri Matteo Ciacci </Td> <Td> 1 April 2018 </Td> </Tr> <Tr> <Td> São Tomé and Príncipe </Td> <Td> President </Td> <Td> Evaristo Carvalho </Td> <Td> 3 September 2016 </Td> </Tr> <Tr> <Td> Senegal </Td> <Td> President </Td> <Td> Macky Sall </Td> <Td> 2 April 2012 </Td> </Tr> <Tr> <Td> Serbia </Td> <Td> President </Td> <Td> Aleksandar Vučić </Td> <Td> 31 May 2017 </Td> </Tr>

List of all the president in the world