The part of the sentence 'has been continuously decreasing' is correct and usable in written English.
You can use this phrase when describing a trend that has been gradually decreasing over a period of time. For example, "Pollution in the area has been continuously decreasing since the city implemented new environmental regulations."
In the Central Valley, water storage has been continuously decreasing due to large scale agriculture.
Mobility of the young population between 6 and 10-year-old has been continuously decreasing the last decades causing problems of health (obesity) and decreasing the development of spatial skills along with the sense of community.
Rice consumption has been continuously decreasing as the eating habits of Koreans have become westernized and diversified.
While it was long believed that the expansion rate has been continuously decreasing since the Big Bang, recent observations of the redshift-distance relationship using Type Ia supernovae have suggested that in comparatively recent times the expansion rate of the Universe has begun to accelerate.
The age-adjusted mortality rate has been continuously decreasing from 56.9 in 1975 to 18.1 in 2010[ 1].
Also in Italy the proportion of PWID among those newly diagnosed with AIDS has been continuously decreasing, from 62.4% before 2001 to 17.6% in 2011/12 [ 4].
In Thailand, common species, e.g., threadfin bream, bigeye snapper, have been continuously decreasing in quantity (Yanpakdee et al. 2009).
It was outlined that in the indoor environment, formaldehyde concentrations have been continuously decreasing, down to current levels of 20 40 ppb.
In 2007, reports were published indicating that the suicide warnings might have been counterproductive, because young suicides in USA showed a sudden 14% increase (girls 33%) in 2004, after previously having been continuously decreasing since 1988 3, 7, 8.
If a source has been continuously searched for a long time, its nectar amount did not decrease and it might be abandoned by honey bees.
However, as the rate estimate continuously decreases with the measurement timescale, this would posit that the biology of FVs has been continuously changing with time in such a way that that the viral rate of evolution gradually increases through time.
