Bad state of the dollar bills

I do not use cash in most transactions but in some cases where I have to use it ( most fast food restaurants ) I have started seeing a trend in getting back highly soiled and dirty bills ( $1 and $5 especially ) back in change. This never used to be the case when I first came in 93 and even as late as 2000. Most of the time I used to get decent quality bills as change. Reminds me of my times back in India ( 12 years back) where this was the norm. In fact it became so unmanageable that the Indian government banished the bills for 1,5 and even 10 I think and have substituted them with the coins.