In 2011, nonresidential building construction provided almost a quarter of the 195,000 jobs for contractors, with average salaries at $45.41 per hour, or $94,450 per year. Building equipment contractors contained 14 percent of the positions at a mean $46.52 per hour, or $96,750 per year.
Burps can also be caused by drinking carbonated beverages, such as beer, soft drinks, energy drinks, and wine in which case the expelled gas is primarily carbon dioxide from the drink itself. Common diabetes drugs metformin and Byetta can cause burping, especially at higher doses. This often resolves in a few weeks.
Swallowing Air. Swallowing large quantities of air can cause more-frequent belching. People who eat quickly, drink carbonated beverages (such as soda and beer)---especially through a straw---and chew gum may all be more likely to burp on a more-than-regular basis. Smokers are also a risk group when it comes to excessive belching, according to the Mayo Clinic.