How much per year has globalization affected us income?

During intensive periods of outsourcing, etc., US employment and average income rates have been at trends similar to trends before the prevalence of outsourcing, etc. And these trends have been to increase. Economic theory states that average income in countries with free trade will increase, and there is significant empirical evidence supporting this.

However, the effect on individuals varies widely based on which field they are in. Generally speaking, unionized private-sector outsourceable low- and mid-skilled workers (manufacturers of stuff like cars and computers) have been negatively effected by globalization, whereas high-skilled workers and non-outsourceable workers (like construction) have benefited.

Note that globalization has decreased the price for many consumer items. This means that the cost of living has gone down for many Americans (remember how expensive furniture was before Ikea, and clothing before Walmart?). A decrease in cost of living is effectively an increase in real income.

All in all, globalization has been economically beneficial to America. But the effects on you depend on your skill set and current field.