The phrase "in the share of" is correct and usable in written English.
It is often used to denote a portion or proportion of something. For example, "They split the costs in the share of 50/50."
These two factors have combined to produce a decline in the share of middle-class wealth".
The players have offered to accept a small reduction in the share of revenue they receive.
Most dramatic has been the fall in the share of wages in GDP.
There has been no recovery in the share of population working.
It does not reflect an increase in the share of workers finding jobs.
All these countries have seen gigantic increases in the share of fathers who go on leave.
The increase in the share of female directors has stagnated in Britain.
The most reputable surveys show a decline over time in the share of households with guns".
There was no meltdown and indeed even a tiny increase in the share of the vote.
But progress is sluggish – for example 2010-11 saw a further small increase in the share of spending in acute hospitals and a reduction in the share of spending in primary care.
Instead he argues, "we have to face up to the fact that this is also a wage versus profit problem – with an increase in the share of profits, and a decrease in the share of wages".
