en.wikipedia.org/wiki/Face_masks_during_the_2019%E2%80%9320_coronavirus_pandemic
"Hong Kong: Members of the public are recommended to wear a surgical mask when taking public transport or staying in crowded places."
recommended, not compulsory.
"South Korea: Masks have been widely used by healthy individuals despite absence of official advice to do so"
absence of endorsement; not universal
"Germany: On March 31, city-county Jena, Thuringia, was the first large German city to introduce an obligation to wear masks, or makeshift masks including scarves, in supermarkets, public transport, and buildings with public traffic, from April 6, very successfully. On April 2, the Robert Koch Institute, the federal epidemic authority, changed its previous recommendation that only people with symptoms should wear masks to also include people without symptoms.[128][129] County Nordhausen, Thuringia, followed the example of Jena, since April 13, several other cities later. German chancellor Merkel and state governors first gave "strong advice" to wear face masks in public from April 20, Saxony made it mandatory from that day, Saxony-Anhalt followed from April 23 and (the rest of) Thurinigia from April 24, finally the governors agreed to make it mandatory, so most other states followed from April 27, except Schleswig-Holstein, from April 29, and Berlin, where shops were excluded first, they were included from April 29."
increasingly became obligatory
"Singapore: Masks have been widely used by healthy individuals despite initial absence of official advice to do so.[157] General mask-wearing was no longer discouraged from April 3,[158] and made mandatory outside of one's residence from April 14"
move only 2 weeks ago to compulsory.
I guess the source for your chart is a Prof. of chemical technology?
According to a survey conducted in South Korea, around 70 percent of respondents stated that they started to wear face masks after coronavirus outbreak. About 19 percent were already wearing masks even before the outbreak and another 11 percent said they do not wear masks regardless of coronavirus. The most popular type of face masks among South Koreans was KF94 health masks.
I guess people must like masks because they think masks are harmless and easy but most importantly something simple they understand and they think they can control.
What kind of mask are you wearing, OP? Do you ever worry you have made surgical masks more expensive for local careworkers to buy?