What is the success rate of Japan, marriage immigration and Japan?

I'm afraid it's a little difficult because:

Among the 1 and1.200 million Japanese, about 1%-5% of the total population are married to foreigners. Whether through "business" channels or people who have met, fallen in love and got married, in the past 20 years, less than 1000 people in China have married Japanese every year, among which only about 20% of China men have married Japanese women. The divorce rate is high.

2. Japan is a non-immigrant country and has no immigration application. However, if you have been married to a Japanese for more than 3 years, you may obtain Japanese nationality or permanent residence (green card).