Hello Reski!
Allow me to give you some suggestions.
..., health care were the smaller
smaller -> comparison
The smallest -> superlative
... were the higher percentage than others.
higher-> comparison
The highest -> superlative
However, Japan havehad 10% in transportation categories ...
PAST TENSE
On the contrary, food was the highesttook higher percentage tha n health care and clothing.
Instead of using those words repetitively, I suggest you these similar words.
Food = Groceries
Housing = Accommodation
Clothing = Dress needs
Hope it helps you :)