Amazon

• Created in 1994. 
• It had 11 employees in 1995. 
• The company has grown to 614 employees in 1997. 
• In 1998, it reached 2,100 employees.
• Two years later, in 200, Amazon had a total staff of 9,000 workers.
• In 2001, this number reached 7,800 employees.
• In 2002, due to the dot-com bullble crash, the number of employees decreased to 7,500.
• In 2005, it grew again to 12,000 employees.
• Two years later, the Amazon staff reached 17,000 employees.
• It then jumped from 24,300 to 56,200 between 2009 and 2011.
• By 2013, it passed the 100,000 mark with 117,300 workers.
• It kept growing year by year with 154,100 in 2014, 230,800 in 2015 and 566,000 in 2017.
• Finally, Amazon had 613,300 employees in 2018.

Facebook

• Created in 2004. 
• In 2004-2005, Facebook had 20 employees. 
• In 2011, the company had 3,200 employees.
• In 2012, it had 4,619. 
• In 2013, it reached a staff of 6,337. 
• Facebook had 9,199 employees in 2014 and 12,691 in 2015.
• Its staff has then grown from 17,084 in 2016 to 25,105 in 2017 and 35,587 in 2018.
• Finally, in 2019,the company employed 44,942 workers.

Google

• Created in 1998. 
• 2007: 16,805 employees
• 2008: 20,222 employees
• 2009: 19,835 workers
• 2010: 24,400 employees
• 2011: 32,467 employees
• 2012: 53,861 employees
• 2013: 47,756 employees
• 2014: 53,600 workers
• 2015: 61,814 employees
• 2016: 72,053 employees
• 2017: 88,110 employees
• 2018: 98,771 employees

Apple

• Founded in 1976. 
• Between 2005 and 2018, the number of Apple employees has increased from 16,820 to 132,000. 

Tesla

• Founded in 2003. 
• The number of Tesla employees has increased from 899 in 2010 to 48,817 in 2018.