Grammar
N3AI-drafted〜ばかりだ(変化)
keeps getting (worse); change in one direction only
Formation
V辞書形 + ばかりだ
Usage
Attached to the dictionary form of change verbs (増える、減る、悪くなる、下がる…), it says a situation keeps moving in one direction, almost always an undesirable one. It is a written, somewhat formal expression often found in reports and newspapers, and 一方だ is a close synonym. Do not confuse it with V-たばかりだ (have just done) or 〜てばかりいる (do nothing but).
Examples
物価は上がるばかりだ。
ぶっかは あがるばかりだ。
Prices just keep going up.
手術のあと、父の体は弱くなるばかりです。
しゅじゅつの あと、ちちの からだは よわく なるばかりです。
Since the operation, my father's health has done nothing but decline.
この村の人口は減るばかりで、若者の姿はほとんど見られない。
この むらの じんこうは へるばかりで、わかものの すがたは ほとんど みられない。
The village population keeps falling, and you hardly see any young people.