Context: Meanwhile, with the advent and popularity of Internet-based distribution of files in lossily-compressed audio formats such as MP3, sales of CDs began to decline in the 2000s. For example, between 2000 - 2008, despite overall growth in music sales and one anomalous year of increase, major-label CD sales declined overall by 20%, although independent and DIY music sales may be tracking better according to figures released 30 March 2009, and CDs still continue to sell greatly. As of 2012, CDs and DVDs made up only 34 percent of music sales in the United States. In Japan, however, over 80 percent of music was bought on CDs and other physical formats as of 2015.

Question: What portion of music sales did CDs and DVDs account for in the United States as of 2012?
Answer: 34 percent

Question: Which country attributes over 80 percent of its music sales to physical formats?
Answer: Japan

Question: How are MP3s compressed?
Answer: lossily-compressed

Question: When did CD sales experience their original decline?
Answer: 2000s

Question: What has caused a decrease in CD sales?
Answer: Internet-based distribution of files

Question: In what year did CDs have an unusual spike in sales?
Answer: Unanswerable

Question: What percentage of music sales do MP3s make up?
Answer: Unanswerable

Question: How are CDs compressed?
Answer: Unanswerable

Question: By what percentage have DIY and independent CDs increased?
Answer: Unanswerable

Question: When did MP3 sales take off in Japan?
Answer: Unanswerable