"notably decreased" is a correct phrase used in written English.
You can use it when referring to a decrease of some sort that has taken place in a noticeable fashion. For example: "Sales revenue for the quarter notably decreased compared to the same period last year."
Smith, who was speaking as the guest director of this year's Brighton festival, said the report – containing figures that showed children's overall contact with the arts in school has notably decreased over the past five years – were the sign of an education system "going backwards".
Concentrations measured in road runoff notably decreased after soil filtration.
Conclusion: Prevalence of CS in AMI patients has notably decreased over the past 20 years.
By introducing a partial interference cancellation scheme, outage probabilities are notably decreased.
ZnPP notably decreased HO-1 expression but did not markedly affect Nrf2 expression.
The curing behavior analysis showed that the introducing of DL notably decreased the curing activation energy.
Rehydration ratio notably decreased with an increase in drying pressure, while percentage shrinkage increased with an increase in drying pressure.
The ultimate compressive strain ranged from 0.00391 to 0.00494, which decreased with an increase in MMA contents and notably decreased with a decrease in curing temperatures.
The angiogenic inhibitors, OGF and retinoic acid, notably decreased the total number and length of blood vessels in the CAM preparations.
As a single agent, oral silibinin meglumine notably decreased the overall volumes of NSCLC tumors as efficiently as did the EGFR tyrosine kinase inhibitor (TKI) gefitinib.
At the upper slope positions, intensive tillage notably decreased the concentrations of soil organic carbon (SOC) and total nitrogen (TN) in the whole soil profile.
