I think around 2000 or 2001 the number was more "streamlined" as in both numbers were moved closer to each other and made skinnier. Maybe even skewed to the rear a tiny bit.
Here is what it looked like in 2000
And the next year, 2001
Better shot from 2002. It's been basically the same ever since.
Compare to the most recent of 2014
And I believe this is what it looked like the rookie year (1992) through 2000.