When was the last time the $1 bill changed meaningfully? You can't get more consistent than that. The $20 changed significantly in 1998 and had a refresh in 20

When was the last time the $1 bill changed meaningfully? You can't get more consistent than that. The $20 changed significantly in 1998 and had a refresh in 2004. 20 years of consistent design since then though. And all the bills are the same shape, size, and color, other than war issues. Can't get more consistent than that.