Terms for subject Mathematics containing over the years

English	Russian
over the years	с годами (e.g.: Our original black-and-white catalogue was a simple list of products, and over the years we have grown this into a colourful 350-page-long publication featuring thousands of amazing items. // ART Vancouver)
the above results were obtained in a period of a little over four years	немногим более
within the span of a little over five years	за период немногим более 5 лет