"again decreasing" is a correct and usable phrase in written English.
You can use it when something has already been decreasing and is now decreasing even further. For example: "With the new restrictions being imposed, the already decreasing attendance rate at public shops is again decreasing."
And when appointments are made months in advance, no-shows are more common, doctors say, again decreasing the number of women who are being screened.
Alkaline pH values around 11 may result in the formation of carbonate and bicarbonate during organic mineralization, again decreasing the efficiency of COP (Xiong et al. 2003).
For Scale 3 eruptions, the probability is 1 up to 600 m away from the centre on the northern shore, while the other shores show probabilities between 0.125 and 0.75, again decreasing with distance from the vent.
This is discussed in more detail in Section 5) Northward of the crustal magnetic polarity reversal at −57° and southward of the electrojet centered near −51°, the crustal field has an upward vertical component while the current generated field is predominantly downward, again decreasing the ambient field.
In the present study, attentional modulation was strongest with the intermediate notch widths (e.g., ±150 Hz and ±80 Hz; see Figures 3 and 4), again decreasing in amplitude with ±40 Hz notch and plain white noise.
At the 1-Ma-scale, there is a low in originations in the late Guadalupian (Capitanian), with a subsequent increasing trend towards the early Changhsingian and then again decreasing numbers in the latest Permian.
In the mesosphere, temperatures again decrease with increasing altitude.
You're never going to have an article on the BBC or CNN that begins by saying: 'There's no famine in south London today' or: 'Child mortality again decreased by 0.005% in Botswana'.
Above the peak, it again decreases rapidly with increasing temperature (the third stage).
In 2015, they began to increase as oil prices again decreased relative to exported commodities.
From Fig. 5, G-35 again decreases the load power of bus-21.
