# ATR statistics: ATR list growth

Article from the series "ATR statistics"

## Evolution of the number of ATRs

Since 2002 I add new ATRs in the ATR list, ATRs submitted by users of my tools: ATR_analysis and Smart card ATR parsing. I wanted to know how regularly I did that over the lifetime of the project (more than 14 years now).I now have 2098 ATR entries in my list.

## Graph

I am really surprised by the linearity of the curve.

The curve does not start at 0 ATR because the first versions of the list were stored in CVS Version Control System (I then used Subversion and now GIT). It looks like I lost the CVS history when I moved to Subversion in 2009.

The linear correlation equation is (according to Numbers): y = 6.308e-6 x - 940.4

That is a progression of 6.308x10

^{-6}ATR per second, or 0.54 ATR per day, or 3.8 ATR per week, or 199 ATR per year.

The coefficient of determination R

^{2}is equal to 0.996 (very close to 1) so the linear approximation is quiet good.

## Conclusion

The progression may stay constant as new smart cards, with new ATRs, are continuously delivered to users by smart card providers.Maybe this data is a good indication of the health of the smart card industry? What do you think?