the year ended December 31, 2020, our revenue from directly-operated salons and from franchising decreased to JPY2,026,806 thousand (US$19,641 thousand) and JPY1,289,141 thousand (US$12,493 thousand), respectively.
The primary factor for the decrease in revenues from directly-operated salons between year end 2019 and 2020 was the decrease in the number of customers due to the COVID-19 pandemic. In the year ended December 31, 2019, our salons had customer visits of 857 thousand, while in the same period of 2020, the figure was 650 thousand excluding visitors to our JOYHANDS WELLNESS salons located in spa facilities (for which data is not available).
The primary reason for the decrease in revenues from franchising was also the decrease in the number of customers due to the COVID-19 pandemic. In the year ended December 31, 2019, our franchised salons had served 302.9 thousand customers, while in the same period of 2020, franchised salons served 187.5 thousand customers. Although this decrease in revenue by our franchisees resulted in less royalty income for the Company, our expenses for providing supporting services to our franchisees decreased accordingly.
We recognize revenue from initial franchise membership on the opening date of the new franchised salons. In addition, our revenue from franchise royalties includes revenues from recurring royalty income, rental income from subleased salon properties, construction of franchised salons, uniforms and training sales.
The revenue from our Preventative Healthcare Segment decreased 41.1% for the year ended December 31, 2020 compared to the same period in 2019, as a result of a slower increase in the number of participants in the Health Guidance Program during the COVID-19 pandemic. Our MOTHER Tracker®is still at the development stage and as such generates no revenue.
Cost of Revenues
For the year ended December 31, 2019 and 2020, the cost of revenues was JPY 2,957,506 thousand (US$28,661 thousand) and JPY2,912,667 thousand (US$28,226 thousand), respectively. Total cost of revenues stayed relatively flat for the year ended December 31, 2020 compared to the prior year as a result of an increase in the total number of salons from 283 to 290, offset by cost reduction efforts to mitigate the impact of COVID-19. These cost reductions included furlough of our relaxation therapists and employees, as well as temporary rent reductions negotiated with the landlords. The cost to revenue ratios were 75.7% during the year ended December 31, 2019 and 87.2% during the comparable period in 2020. Total cost of revenues as a percentage of revenue increased from the prior year as a result of lower revenue levels due to COVID-19, which outpaced the decreases in cost of revenues.
The cost of revenue from directly-operated salon increased by JPY236,950 thousand (US$2,296 thousand) from JPY1,912,893 thousand (US$18,538 thousand) in the year ended December 31, 2019 to JPY2,149,843 thousand (US$20,833 thousand) in the year ended December 31, 2020. The cost of revenue from franchising activities decreased by JPY274,854 thousand (US$2,664 thousand) from JPY1,019,956 thousand (US$9,884 thousand) in the year ended December 31, 2019 to JPY745,102 thousand (US$7,221 thousand) in the year ended December 31, 2020. The increase in cost of revenues from directly-operated salons and the corresponding decrease in cost of revenues from franchised salons was due to the acquisition of franchised salons and conversion into directly-operated salons.
Selling, General, and Administration Expenses
For the year ended December 31, 2019 and 2020, the selling, general, and administration expenses were JPY871,862 thousand (US$8,449 thousand) and JPY1,068,537 thousand (US$10,355 thousand), respectively. The percentage of revenue of selling, general, and administration expenses in the year ended December 31, 2019 and 2020 was 22.3% and 32.0%, respectively. The increase in 2020 was a result of an increase in the number of new college graduate employees, moving expenses incurred in connection with the relocation of our headquarters, and professional fees incurred in connection with our initial public offering.