Looking on the internet deeply has found these results:

in a 60% is the most popular phrase on the web.

by 60% 135,700,000 results on the web	in a 60% 1153,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Together they are attacking a legitimate government of a great and strongly pro · The perceived cost of complying with different national laws regulating consumer transactions was seen by 60% of the retailers as an obstacle that caused them concern. It is essential that Europe takes the lead in this area, as finding a solution to the problem of coal is crucial, in particular when coal production is expected to rise globally by 60% in the next 20 years. Between 1990 and 2000, the countries of the European Union reduced global mercury emissions by 60%. In my own nation, for example, our budget contributions will rise by 60% over the next 12 months. European Member State, chosen and supported by 60% of Italians. As a first step, these measures include a general increase in the DPRK textile quota by 60%, 50% in the case of a few product categories. World energy demand and carbon dioxide emissions are expected to rise by 60% by 2030.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

by 60%

135,700,000 results on the web

in a 60%

1153,000,000 results on the web

More popular!

Together they are attacking a legitimate government of a great and strongly pro
· The perceived cost of complying with different national laws regulating consumer transactions was seen by 60% of the retailers as an obstacle that caused them concern.
It is essential that Europe takes the lead in this area, as finding a solution to the problem of coal is crucial, in particular when coal production is expected to rise globally by 60% in the next 20 years.
Between 1990 and 2000, the countries of the European Union reduced global mercury emissions by 60%.
In my own nation, for example, our budget contributions will rise by 60% over the next 12 months.
European Member State, chosen and supported by 60% of Italians.
As a first step, these measures include a general increase in the DPRK textile quota by 60%, 50% in the case of a few product categories.
World energy demand and carbon dioxide emissions are expected to rise by 60% by 2030.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.