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Not sure about the 50-50 split, but while searching my area (North Central, FL + 500 miles) I found more Black than SBY Laguna Seca's. In the 2012 Laguna Seca production run I have found more Black/Red than Silver/Red. Of course, this is only empirical, just my limited musings. There are other threads on this forum with production numbers for 2012 501A located here 2013 501A located here.
According to the certification letter in my Owner's Kit, my LS is #196 and the 125th in Black. Since this car only comes in either Black or SBY that would indicate that by the time my LS was built that there were 71 SBY LS Boss'.