Answer:
No it doesn't mean that the US is regressing, this happens because it is much easier for poor countries to grow at faster rates than rich countries. When you are poor, a small increase in your salary will result in a large percent increase. E.g. your current salary is $20,000 per year, and you get a $2,000 increase which results in a 10% increase. If you earn $150,000 a year, to increase your salary by 10%, you would need $15,000.
This is happening to China since 20 years ago it was growing at more than 10% per year, but currently is going at only 6%.