1. United States: According to a 2018 survey by the National Endowment for the Arts (NEA), 21% of Americans aged 18 and older had participated in playing the piano in the previous 12 months.
2. United Kingdom: A 2015 study by the ABRSM (Associated Board of the Royal Schools of Music) found that an estimated 14% of people in the United Kingdom aged 5 and older played the piano.
3. Germany: A 2016 study by the German Music Council reported that approximately 10% of the population in Germany played the piano.
4. China: While comprehensive data is limited, a 2016 study conducted in urban areas of China estimated that about 12% of the surveyed population played the piano.
These figures suggest that the percentage of the population playing the piano varies across countries, with estimates ranging from around 10% to 21%. However, it's important to note that these numbers are based on self-reported data, which may be subject to biases or inaccuracies. Additionally, the participation rates can vary depending on factors such as age, socioeconomic status, cultural background, and education opportunities.