Thanks to OpenTable for providing this restaurant data:
This data shows the year-over-year change in diners as tabulated by OpenTable for the US, the states of Washington and New York, and a few impacted cities (Seattle, San Francisco, and Boston).
This data is updated through March 18, 2020.
The US was off 91% YoY as of yesterday.
San Francisco, Boston and Seattle are off 100%. Going forward, restaurants have close in most states (except take out and pick up)
The laggards are Oklahoma (off 70%), Hawaii (off 71%) and Alabama (off 78%).
When the crisis is ending, I'll post this data again.