WASHINGTON (AP) — The Biden administration says it’s seeing a big uptick in the number of new customers buying private health insurance for 2023 from the Affordable Care Act’s marketplace. Nearly 3.4 million people have signed up for coverage. That’s an increase of 17% compared to the same time last year. The boost in enrollment comes as the number of uninsured Americans this year reached a historic low of 8%. The boost in enrollment is largely driven by generous subsidies — extended through 2025 in the Democrats’ $1.9 trillion coronavirus relief law — that keep monthly premiums payments at $0 or just a few dollars monthly for most people who sign up.