To clarify this, they see themselves as part of the Chinese civilization (華人 = hua ren). A lot of Chinese diaspora do as well, for example Chinese Singaporeans are part this cultural sphere.

Taiwanese people have another term for Chinese Mainlanders (大陸人 = da lu ren).

The data: https://esc.nccu.edu.tw/PageDoc/Detail?fid=7800&id=6961

So about 29.9% say Taiwanese + Chinese and 2.6% say exclusively Chinese.

% lower and lower. The recent 228 isa case. Many Taiwanese considered themselves Japanese as well. And many just Taiwanese. Let there be a vote ... actually it has been voted sort of.