Not for the lactose intolerant, this simple line graph shows the per capita consumption of cheeses over the past 40+ years.

During this time period, the total consumption of cheese in the USA has tripled from 11.37 pounds per person per year in 1970 to 33.5 in 2011. Mozzarella has shown the most growth in consumption, going from 1.19 pounds per person per year to 11.43! It is now more popular than cheddar, which has had relatively constant demand since the mid-1980s. Note that some people would argue that mozzarella is a dairy, not a cheese, but these data categorize it as a cheese.

Data source: http://www.ers.usda.gov/data-products/dairy-data.aspx