The Optional vs. The Necessary

Consider this table of data relating to the number of plastic surgery procedures and the number of cardiac surgeries each year:

Number each year	1997	2003
Plastic surgeries	721,000	1,380,000
Cardiac surgeries	3,230,000	3,550,000

Assuming growth in each row is linear, what are the two expected values for years 2010 and 2025?

• Number of plastic surgery procedures?
• Number of cardiac surgeries?