Internet advertising was the leading source of advertising revenue in the U.S. in 2021. Read the Interactive Advertising Bureau's (IAB) Internet Advertising Revenue Report for the year 2021 (the latest currently available) posted above in PDF format, and answer the following questions based on that report. Answer the questions (and different parts within questions, if applicable, distinctly and separately by numbering them. The total number of points for this assignment is 20. 1. By how much has total internet advertising revenue grown (in terms of both dollars and percentage) between 2011 and 2021? (4 points) 2. Between which two consecutive years (in the range 2011-2021) did total internet advertising revenue enjoy the maximum percentage growth? Identify the two consecutive years and the percentage revenue growth. (2 points) 3. For all years between 2011 and 2021, internet advertising revenues have been higher during the last six months of the year compared to the first six months. A) Can you offer a possible reason why revenues have been higher during the last six months of the year compared to the first six months? (2 points) B) In which year was the revenue gap between the first and the last six months the highest? By how many dollars? (2 points) C) In which year did mobile advertising make up more than 50% of the internet advertising revenue in the U.S. for the first time? (2 points) 4. A) Which online advertising format generated the highest percentage of online ad revenues during all of 2021? State the format and the corresponding percentage. (2 points) B) Which online advertising format generated the lowest percentage of online ad revenues during all of 2021 State the format and the corresponding percentage. Disregard the "other" category. (2 points) C) By how much did the percentage contribution of display ads to the total online ad revenues change from 2020 to 2021? (2 points) 5. By what dollar amount did the revenue from mobile digital video ads increase from 2019 to 2021? (2 points)