Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Data are presented in a 6-week interval and have been fitted with a 6-week moving average line. The dark-blue dashed line indicates the pre–COVID-19 period and the orange line the post–COVID-19 period. The vertical blue dotted line indicates the start of the COVID-19 pandemic.
