<Table> The World's Billionaires <Tr> <Td_colspan="2"> List of the world's billionaires, ranked in order of net worth </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> The net worth of the world's billionaires increased from less than $1 trillion in 2000 to over $7 trillion in 2015 . </Td> </Tr> <Tr> <Th_colspan="2"> Publication details </Th> </Tr> <Tr> <Th> Publisher </Th> <Td> <Ul> <Li> Whale Media Investments </Li> <Li> Forbes family </Li> </Ul> </Td> </Tr> <Tr> <Th> Publication </Th> <Td> Forbes </Td> </Tr> <Tr> <Th> First published </Th> <Td> March 1987 </Td> </Tr> <Tr> <Th> Latest publication </Th> <Td> March 6, 2018 </Td> </Tr> <Tr> <Th_colspan="2"> Current list details (2018) </Th> </Tr> <Tr> <Th> Wealthiest </Th> <Td> Jeff Bezos </Td> </Tr> <Tr> <Th> Net worth (1st) </Th> <Td> US $112 billion </Td> </Tr> <Tr> <Th> Number of billionaires </Th> <Td> 2,208 </Td> </Tr> <Tr> <Th> Total list net worth value </Th> <Td> US $9.1 trillion </Td> </Tr> <Tr> <Th> Average net worth </Th> <Td> US $4.1 billion </Td> </Tr> <Tr> <Th> Number of women </Th> <Td> 256 </Td> </Tr> <Tr> <Th> Number of people aged 40 years or less </Th> <Td> 63 </Td> </Tr> <Tr> <Th> New members to the list </Th> <Td> 259 </Td> </Tr> <Tr> <Td_colspan="2"> Forbes: The World's Billionaires website </Td> </Tr> </Table> <Tr> <Td_colspan="2"> List of the world's billionaires, ranked in order of net worth </Td> </Tr>

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