What is the shape of the most favorite beard like this when charting the beard hair style of a college graduate for over 100 years?

From the graduation photographs of over 100 years college students from 1898 to 2008, I made a chart to show how big the whisker style is popularReddit userAppeared. How a lot you create graphs from more than 90,000 photos a year, you can see a very interesting trend.

University Graduate Facial Hair Styles 1898-2008 [OC]: dataisbeautiful
https://www.reddit.com/r/dataisbeautiful/comments/64q73v/university_graduate_facial_hair_styles_18982008_oc/

This is how facial hair of university grads has changed since 1898 - The Verge
http://www.theverge.com/2017/4/16/15304918/facial-hair-university-graduate-data-sideburn-beard-moustache

This is the graph created by reddit user Mystic Toaster. The vertical axis shows the ratio and the horizontal axis shows the year.


There are various styles in the beard, but in the graph, we have classified the university graduate beard style into the following seven types + all eight types without beard.

◆ Full beard / Chinstrap(pink)
"Full beard / Chinstrap" is the most stingy style that all the beards of the nose, chin, and cheeks were connected and grew strongly

BySascha Kohlmann

◆ Goatee(light blue)
"Goatee" is a style that grows beards that hang long like a goat on the lower jaw

ByKevin Dooley

◆ Moustache(orange)
Mouth beard that grows under the nose is "Mustache"

ByAlice Keeler

◆ Moustache (with Muttonchops)(Darker light blue)
"Mustache (with Muttonchops)" is a mouth beard + a cheek

ByNathanael Burton

◆ Moustache (with Sideburns)(purple)
"Mustache (with Sideburns)" is a mouth beard + sideburns (or shorter cheeks)

ByJohn Markos O'Neill

◆ Muttonchops(Yellow green)
"Muttonchops" is a cheek

ByIstolethetv

◆ Sideburns(Red)
"Sideburns" means sideburns (or shorter cheeks)

ByRyan

◆ Cleanshaven(Blue)
"Cleanshaven" is a beautiful beardless beardless style

ByUzi 978

As you can see at a glance on the graph, almost everything was occupied by two types of "beardless" and "mustache" from 1898 to around 1960, but it has become popular to grow beard at once in the late 1960s , In 1973 only 10% of students without beard style are. What I most liked most of this whisker style heyday is the style that grows beard hair. Beard and sideburn style are popular in the 1970s. After that, the mustache has been revitalized, the style that grew chin, mouth, cheeks and big beards became popular, and the style that stretches the beard like a goat became popular and the flow of various outbreaks was able to follow with the eyes.

Sideburn style seems to be unfamiliar in Japan, but among university graduates in the United States seems to have considerable support rate from around the 1970s and 1990 to the present. It is unknown whether these are grown from "being squid" or "processing is troublesome" but it is unclear whether making similar graphs in Japan, it seems to be totally different results.