To get an idea of how the prices of popular grocery items have changed since 2012, you can use the Bureau of Labor Statistics Price Index. This index tracks the price of items over time, allowing you to compare the price changes of different items. For example, the average price of a gallon of milk in 2012 was $3.45, whereas in 2020 it rose to $3.77. Similarly, the average price of a dozen eggs in 2012 was $2.22, and in 2020 it increased to $2.44. This shows that the prices of both of these grocery items have increased over the years.