Florida didn't get hit bad in 2020 with really high hospitalizations like they are now. That was one of the strange ironies. They had a high positivity rate and large numbers in the hospitals, but not as bad as now. Also, the treatment has changed some since then. The US didn't really have any oxygen shortages that I recall last year. Maybe it's a cumulative thing, where a lot was used last year/early this year, and there just isn't more now. Also, with other countries, like India and Brazil using large supplies, it's probably creating a worldwide deficit.