R/Variants per time

Number of inscriptions containing variants of R per time span:

-750+	–	–	–	–	–	–	–	–
-650+	1	–	–	–	2	–	–	–
-550+	7	–	1	–	1	–	–	–
-450+	10	–	2	–	–	–	–	–
-350+	5	2	1	–	–	–	–	–
-250+	3	–	3	–	1	–	–	–
-150+	45	1	11	2	–	3	–	2
-50+	8	–	3	–	–	4	2	–
50+	–	–	–	–	–	1	–	–
150+	1	–	–	–	–	–	–	–