Essentially they create them as they go.

Total shares outstanding plus outstanding stock awards:

    Dec 2011 : 468 million
    Dec 2012 : 470 million
    Dec 2013 : 476 million
    Dec 2014 : 483 million
    Dec 2015 : 490 million
    Dec 2016 : 497 million
    Dec 2017 : 504 million
    Dec 2018 : 507 million
    Dec 2019 : 512 million
    Dec 2020 : 518 million

Existing shareholders lose 1% per year.