My theory:
Individuals have almost no control over their payroll taxes. Really only 2 options; ask your boss to cut your pay or max out the 401(k) and medical savings to reduce taxable income. Not alot of room to maneuver.
Corporations on the other hand have tons of room to control what their taxable income is and when they recognize income (ie moving it from this year to another year). They also have control over when certain losses are recognized. So, they can pair income and losses to show low or zero taxable income in many years. Companies have become much better at, and more aggressive at, minimizing taxable income. When tax rates were low, their level of effort put into avoiding taxes was less but these days, any well run company, from mom and pops on up to the largest, operates on the premise at any taxable income at the end of the year is regarded as a failure.
Actually, individuals do have control over at least the federal income tax that is withheld from their paycheck, through the claiming of dependents on their W-4.
Fact of the matter is, a large percentage of the payroll taxes may be paid back to the employee when they file their return in the form of refunds. Remember too, that in terms of the non-income payroll taxes, the employer and employee split that obligation, but I do not see that included in the corporate tax line in this chart.