Final answer:
The overcrowding in jails in the United States has started to decline in recent years, but it remains a significant issue. The exact current percentage of jail capacity is not provided, but the United States has the highest incarceration rate in the world.
Step-by-step explanation:
In recent years, the overcrowding in jails has started to decline in the United States, but it is still a significant issue. The total correctional population, which includes inmates in prisons, jails, and juvenile facilities, peaked in 2007, with approximately 7.3 million people under correctional supervision. The ratio has improved to 1 in every 40 people in 2018, which indicates a decrease in overcrowding.
Unfortunately, the exact current percentage of jail capacity is not provided in the information given. However, it is important to note that the United States has the highest incarceration rate in the world, with over 2 million people locked up in 2017. This means that the percentage of jail capacity is likely still high, although it may have decreased in recent years.