Dear Stata User, I have one continuous independent variable (i.e., hhi), and other two variables d_noc (1 for low activity, 2 for medium activity, and 3 for heavy activity) and year (i.e., 2005, 2010, and 2012). I am interacting hhi with year and d_noc with year. Here is my code and results,

reg lpc lrmpce rp c.hhi##i.year i.d_noc##i.year Percapita_land hhsize
lpc Coef. Std. Err. t P>t [95% Conf. Interval]
lrmpce .3867388 .0055771 69.34 0.000 .3758062 .3976714
rp -.4593788 .0646241 -7.11 0.000 -.5860596 -.332698
hhi .5032779 .0389367 12.93 0.000 .4269514 .5796044
year
2010 .0559579 .0207787 2.69 0.007 .0152259 .0966899
2012 -.033585 .0198135 -1.70 0.090 -.0724249 .0052549
year#c.hhi
2010 .0279062 .0649826 0.43 0.668 -.0994773 .1552897
2012 .203746 .0707064 2.88 0.004 .0651421 .3423498
d_noc
2 .0030683 .0222467 0.14 0.890 -.0405412 .0466778
3 .0500142 .0115372 4.34 0.000 .0273982 .0726302
d_noc#year
2 2010 -.0479457 .0299748 -1.60 0.110 -.1067044 .0108131
2 2012 -.0254392 .0295463 -0.86 0.389 -.083358 .0324796
3 2010 .0029799 .0171642 0.17 0.862 -.0306666 .0366263
3 2012 .0029496 .0162405 0.18 0.856 -.0288862 .0347855
Percapita_land .0003437 .0039694 0.09 0.931 -.0074375 .0081248
hhsize -.0069695 .0010187 -6.84 0.000 -.0089664 -.0049726
_cons 6.267149 .0275047 227.86 0.000 6.213232 6.321066
Please suggest me what is the base category for year#c.hhi and d_noc#year Stata considered during the estimation?